question_answer

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

A)  5 mm                          

B)  4.36 mm

C)  7 mm                          

D)  None of these

Correct Answer: B

Solution :

 Diameter of image \[d=\left( 0.5\times \frac{\pi }{180} \right)\times 500\]