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write 3 difference between concave and convex lens?
write 3 differences between real and virtual images?
What is meant by lateral displacement?
Snell's law states that
u(constant of refraction) = sini/sinr
If a ray of light is passing through a glass slab through its normal, then sin i = 0 and thus the constant of refraction is not mantained.
But as the definition of snell's law suggests that this law is applicable to light travelling obliquely. If this is so, I have a question:
Refraction occurs due to the change in velocity of light in 2 different mediums. This change in velocity occurs as the atoms in a particular media has a specific frequency and if the light wave has a different frequecy, only then will it let the light pass through. But in this process, the light is refracted at some angle. BUT WHY DOES THIS REFRACTION NOT OCCUR WHEN LIGHT TRAVELS THROUGH THE NORMAL?
(I hope you understand the question. If not, pls tell me where I am not clear, i'll try to explain in a better way)
What is the meaning of virtual and erect image???
using mirror formula. prove that in a plane mirror
i)object distance=image distance
ii)image is of same size and it is virtual & erect.
derivation of mirror formula as well as lens formula ?
define power of lens and gives its S.I.unit
WHY CONVEX MIRRORS ARE USED AS VIGILANCE MIRRORS IN DEPARTMENTAL STORES ? WHAT IS THE PRINCIPAL BEHIND IT ?
State the Principle of reversibility of light
explain..why a pencil partly immersed in water appears to be bent at the water surface
what is tyndall effect?
define absolute refractive index of a medium.?
WHAT IS VIRTUAL AND ERECT IMAGE
One half of a convex lens is covered with a black paper.will such a lens produce an image of the complete object?support your answer with a ray diagram.
plz ans. fast as i hv a revision test on monday
write 3 differences between reflection and refraction
Calculate the focal length and nature of a spherical mirror which forms a 1/3 times magnified virtual mage of an object placed 18cm in front of it,
an object is placed at a distance of 10 cm from a convex mirror of focal length 15cm. find the position and nature of the image.
refractive index of glass with respect to air is 3/2..refractive index of water with respect to air is 4/3..what is the refractive index of glass with respect to water?? is it 3/2 divided by4/3 or 4/3 divided by 3/2??
a student focused the image of the candle flame on a white screen using a convex lens .He noted down the positions of the candle flame , screen and the lens as given below
position of candle flame = 12 cm
position of the lens= 50 cm
position of the screen = 88cm
Q 1 find the focal length of the convex lens.
Q 2 Find the position of the image of the candle flame if it is shifted towards the lens at a position of 31cm
Q3 State the nature of the image formned if the candle flame is further shifetd towards the lens..
this is a 10th board question n i m nt able 2 solve it plz helppppp
the history of spherical mirrors in human civilization
Find the focal length of a convex spherical mirror which produces an image 1/6th the size of an object located 0.12 m from the mirror.
What will happen to the focal length if the convex lens is dip inside the water.
the refractive index of diamond is 2.42 what is the meaning of this statement?
what is a focal length of plane mirror
Q1. A concave lens has focal length 20cm.At what distance from the lens a 5 cm tall object be placed so that it forms an image at 15 cm from the lens?Also calculate the size of theimage formed.
Q2. A convex lens has a focal length of 30 cm. Calculate at what distance should the object be placed from the lens so that it forms an image at 60 cm on the other side of the lens?. Find the magnification produced by the lens in this case.
Name the type of mirror used in the following situations.
of a car
mirror of a vehicle
your answer with reason.
An object is kept at a distance of 4m in front of a spherical mirror which forms its erect image at a distance of 1.0 m from the mirror. what is the magnification? Is th mirror concave or convex?
a concave mirror produces 3 times enlarged image of an object placed at 10 cm in front of it.Calculate radius of curvature of mirror
justify and explain this
its a urgent question
1- the fact that a small source of light cast a sharp shadow of an opaque object tells us that light travels in straight line path i dont understand this
2- how and why ddoes any object caste shadow
3- what is the evidence for wave nature of light as well as for particle nature of light
4- explain this line in 150 words and prove this
light is composed of particles which travels in a straight line at very high speed
state snells law of refraction.
If refractive index of glass is 1.65, What is the speed of light in glass?
Define principal focus of a lens ?
Derive lens formula, that is 1/v - 1/u = 1/f
what will be your observation,when an object placed in front of concave mirror,is moving towards the pole of the mirror?
The refractive index of water is 4/3 and for glass is 3/2 w.r.t air. What is the refractive index of glass w.r.t. water?
define principal focus of a Convex lens and Concave lens
define the principal focus of a convex mirror
What is tyndall effect?Explain an example
The rays parallel to the principal axis of a spherical mirror, actually meet at a point 20cm distant from its pole. Identify the mirror and give its focal length.
A concave mirror produces three times magnified real image of an object placed 10 cm in front of it.Where is the image located
DEFINE RARER & DENSER MEDIUM.
why a convex mirror is used as rear view mirror
obtain the formula for the focal length of a lens in terms of object distance and magnification.
A student focussed the image of a candle flame
An object is placed at a distance of 25cm away from a converging mirror of focal length 20cm. Discuss the effect on the nature and position of the image if the position of the object changes from 25cm to 15cm. Justify your answerwithoutusing mirror formula.
When an object is placed at a distance of 50 cm from a concave mirror , the magnification produced is - 1/2 . where should the object be placed to get a magnification of -1/5
what is importance of ray diagram
The magnification produced by a plane mirror is +1. What does this
a convex lens forms a real and inverted image of a needle at a distance of 50 cm from it. Where is the needle placed in front of the lens if the image size is equal to the object size. Also find the power of the lens
The refractive indices of water and glass with respect to air are 4/3 and 3/2 respectively. If the speed of light in glass is 2x 108ms-1, find the speed of light in
what r the properties of convex and concave mirror???
As per my previous questiona parallel beam of light falls on a concave mirror. which type of beam will it produce after reflection? I have asked for the beam ie. coverging or diverging etc. but not for the image. So pl, give me the answer as per my doubt.
Define power of lens.In what SI unit is power of lenses rated?A convex lens has a focal length of 50cm.calculate its power.
a parallel beam of light falls on a concave mirror. which type of beam will it produce after reflection?
find the position of an object when placed in front of a concave mirror of focal length 20 cm produces a virtual image,which is twice size of object.
The magnification produced by a mirror is 1/3 then the type of mirror is --------------. Explain why?
I have read that "plane mirrors are fixed on the inside walls of certain shops (like jewellery shops) to make them look bigger".
If plane mirror forms an image of the same size as the object then how can they be used to make the jewelleries look bigger ?
why danger signals are made of red colours
When a bright object os placed 10 cm away from a concave mirror, its real image is formed at a distance 40cm from the mirror. What is the focal lencgt of the mirror
A STUDENT OBTAINS A BLURRED IMAGE OF AN OBJECT ON A SCREEN BY USING CONCAVE MIRROR. IN ORDER TO OBTAIN A SHARP IMAGE ON THE SCREEN, WHERE HE WILL HAVE TO SHIFT THE MIRROR?
Two mirrors inclined to each other produce 8 images of an object placed between them.Through how much angle should one of the mirror be rotated to get only 2 images
5 cm in length is held 25 cm away from a converging lens of focal
length 10 cm. Draw the ray diagram and find the position, size and
the nature of the image formed.
A glass prism is able to produce a spectrum when white light passes through it but a glass slab does not produce any spectrum. Explain why is it so.
When an object is placed 20cm from a concave mirror , a real image magnified three times is formed. Find:
(a) focal length of the mirror.
(b) where must the object be placed to give a virtual image three times the height of the object?
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