A small object is placed 0.45 m from a convex refracting surface of radius of curvature 0.15m. If the surface separates air from glass of refractive index 1.5, the first and second principal focal lengths are respectively:

-0.30m, 0.45 m

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4.5 m, 3 m

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0.45 m , -0.30 m

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3 m, 4.5 m

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Solution

The correct option is A
-0.30m, 0.45 m

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A small object is placed 0.45 m from a convex refracting surface of radius of curvature 0.15m. If the surface separates air from glass of refractive index 1.5, the first and second principal focal lengths are respectively:

The correct option is A -0.30m, 0.45 m

The correct option is A
-0.30m, 0.45 m