Can you please answer this question.

Dear student,
Please find below the answer:

a. X is the shadow of the man while Y is the reflection or image formed of the man in the mirror.

b. When light falls on an object, the direction of the ray is changed. This change in direction is known as a reflection of light. Image is a true reflection of the body. It is formed by the reflection of light rays by an object. You are able to see something only when reflected rays from a body make an image in your eyes.

For example, you see your reflection in a pool of water or mirror. 

Shadow is an image formed by obstruction of light. One cannot readily identify something by its shadow.

For example, if you place your hand in front of a candle or torch, you will see the image of the hand on the wall. This image will only show the outline of the object placed in front of the light source. 
Hope this clears your doubt.

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