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shalini goyal Grade: 12
        

Q.))a point source of light is from a screen and is kept at d focus of a concave mirror which reflects light on d screen. the focal length of d mirror is 20 cm. The ratio of average intensities of the illumination on d screen when d mirror is present and when d mirror is removed is....


(a)36:1


(b)37:1


(c)49:1


(d)10:1


do reply asap plzzzz........

6 years ago

Answers : (1)

Vijay Luxmi Askiitiansexpert
357 Points
										

Dear Shalini,


Please post your query once.


 


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Vijay Luxmi


6 years ago
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