Q 3 A beam of light converges towards a point O, 10 cm behind a concave mirror of focal - Science - Light - Reflection and Refraction

Question

Q 3 A beam of light converges towards a point O, 10 cm behind a
concave mirror of focal length 20 cm Where is the image formed?
(Ans: v = - 20 3   c m )

Decoder_2 · Accepted Answer

Dear Student ,

F = -20 cm

u = -10 cm
Now from the mirror equation we can write that ,

1/f = 1/u + 1/v   ⇒-1/20 = -1/10 + 1/v  ⇒ 1/v = 1/20   ⇒v = 20 cm

Regards

Q.3. A beam of light converges towards a point O, 10 cm behind a concave mirror of focal length 20 cm. Where is the image formed? (Ans: v = - 20 3 c m )

Q.3. A beam of light converges towards a point O, 10 cm behind a concave mirror of focal length 20 cm. Where is the image formed?
(Ans: $v = - \frac{20}{3} c m$ )