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A converging beam of light is incident o...

A converging beam of light is incident on a concave lens. The beam converges behind the lens at 15 cm from its centre, in the absence of the lens. Select the correct alternative

A

After passing through the lens, beam becomes diverging, what ever may be the focal length

B

If focal length = 10 cm, the beam diverges away

C

If focal length = 20 cm, the beam diverges away

D

Focal length = 30 cm, beam converged at focal point of the lens

Text Solution

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The correct Answer is:
B, D
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