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an equiconvex lens of glass (refractive index=1.5) of focal length 10cm is silvered on one side. it will behave like: a) concave mirror of focal length 10cm b) convex mirror of focal length 5cm c) concave mirror of focal length 2.5cm d) convex mirror of focal length 20cm

an equiconvex lens of glass (refractive index=1.5) of focal length 10cm is silvered on one side. it will behave like:
a) concave mirror of focal length 10cm
b) convex mirror of focal length 5cm
c) concave mirror of focal length 2.5cm
d) convex mirror of focal length 20cm

Grade:12

2 Answers

Nirmal Singh.
askIITians Faculty 44 Points
8 years ago
It will behave like aconcave mirror of focal length 10cm because its a convex lens if both surface have same radius.

Regards,
Nirmal Singh
Askiitians Faculty
vaanya
18 Points
8 years ago
but the answer is concave mirror of 2.5cm. i want to know how to solve it.

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