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A concave lens of focal length 20 cm placed in contact with a plane mirror acts as a convex mirror of focal length

a)

10 cm

b)

40 cm

c)

60 cm

d)

20 cm


Question ID - 153007 | Toppr Answer

A concave lens of focal length 20 cm placed in contact with a plane mirror acts as a convex mirror of focal length

a)

10 cm

b)

40 cm

c)

60 cm

d)

20 cm

1 Answer - 5876 Votes

3537

Answer Key : (a) -

(a)

For lens, mirror combination, combined focal length is given by

Here,

Or



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