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Image Formation by Lenses

Diameter of p...

Question

Diameter of plano – convex lens is 6cm and thickness at the centre is 3 mm. If speed of light in material of lens is $2 \times 10^{8} m / s$ , the focal length of the lens is:

20 cm

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30 cm

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10 cm

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15 cm

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Solution

The correct option is B 30 cm
use trigonometry to find the radius of curvature and once you find the R, use lens maker formula to find the f.
Watch the next video for the solution.

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