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A plano-concave lens is made of glass of...

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

`+0.5" D"`

B

`-0.5" D"`

C

`-2" D"`

D

`+2"D"`

Text Solution

Verified by Experts

The correct Answer is:
B
Power of lens,
`P=(1)/(f)(mu-1)((1)/(R_(1))-(1)/(R_(2)))`
`=(1.5-1)((1)/(oo)-(1)/(1))=0.5(-1)`
`P=-0.5" D"`
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