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
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 | SaraNextGen Top 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
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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 |
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|
a) |
10 cm |
b) |
40 cm |
c) |
60 cm |
d) |
20 cm |
1 Answer
127 votes
Answer Key / Explanation : (a) -
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(a) For lens, mirror combination, combined focal length is given by
Here,
Or |
127 votes
Answer Link
127