A plano-concave lens is made of glass of refractive index 1.5 and the radius of curvature of its curved face is 100 cm. What is the power of the lens?

Question

A plano-concave lens is made of glass of refractive index 1.5 and the radius of curvature of its curved face is 100 cm. What is the power of the lens?

A plano-concave lens is made of glass of refractive index 1.5 and the radius of curvature of its curved face is 100 cm. What is the power of the lens?
A. `+0.5D`
B. `-0.5D`
C. `-2D`
D. `+2D`

Monjur Alahi

8 views

2025-01-04 04:42

1 Answers

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Salim Ahmed Kawsar · Accepted Answer · 2023-02-05T15:29:48+06:00

Salim Ahmed Kawsar

Correct Answer - B
(b) The refractive index is 1.5 and the rdius of curvature of the curved face is 100 cm =1m and of the plane side is `oo`, hence
`P=1/f=(mu-1)(1/R_(1)-1/R_(2))`
Power of the lend,P`=(1.5-1)(1/oo-1/1)=-0.5D`

8 views Answered 2023-02-05 15:29