Optics Question 31
Question: Assertion : For the sensitivity of a camera, its aperture should be reduced. Reason : Smaller the aperture, image focussing is also sharp.
Options:
A) If both assertion and reason are true and the reason is the correct explanation of the assertion.
B) If both assertion and reason are true but reason is not the correct explanation of the assertion.
C) If assertion is true but reason is false.
D) If the assertion and reason both are false.
E) If assertion is false but reason is true.
Show Answer
Answer:
Correct Answer: C
Solution:
Very large apertures gives blurred images because of aberrations.
By reducing the aperture the clear image is obtained and thus the sensitivity of camera increases.
Also the focussing of object at different distance is achieved by slightly altering the separation of the lens from the film.
