First slide

The lens

Question

The sun makes 0.5^o angle on earth surface. Its image is made by convex lens of 50 cm focal length. The diameter of the image will be

Moderate

A

5 mm
B

4.36 mm
C

7 mm
D

None of these

Solution

$Diameter of image d = (0 .5 \times \frac{π}{180}) \times 500 = 4 .36$

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