Click to Chat
1800-1023-196
+91-120-4616500
CART 0
Use Coupon: CART20 and get 20% off on all online Study Material
Welcome User
OR
LOGIN
Complete Your Registration (Step 2 of 2 )
The focal length of a lens of camera is 5f and that of another is 2.5f what is the time of exposure for the second if for the first one is 1/200 sec? a)1/200 b)1/800 c)1/6400 d)1/3200
Dear student f = focal length/aperature f number decrease by 2 Time of exposure should decrese by 2² = 4 Hence time of exposure = (1/4)*(1/200) = 1/800 RegardsArun (askIITians forum expert)
Post Question
Dear , Preparing for entrance exams? Register yourself for the free demo class from askiitians.
points won -