Questions
A concave lens of focal length 20 cm placed in contact with a plane mirror acts as a
a
Convex mirror of focal length 10 cm
b
Concave mirror of focal length 40 cm
c
Concave mirror of focal length 60 cm
d
Concave mirror of focal length 10 cm
detailed solution
Correct option is A
1F=2f+1fm. Here fm=∞, hence F=f2=10cmTalk to our academic expert!
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In a plano-convex lens the radius of curvature of the convex lens is 10 cm. If the plane side is polished, then the focal length will be (Refractive index = 1.5)
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