Optics Question 31
Assertion : For the sensitivity of a camera, its aperture should be increased. 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 are both false.
Show Answer
Answer:
Correct Answer: C
Solution:
Very large apertures give blurred images because of aberrations.
By reducing the aperture a clearer image is obtained and thus the sensitivity of the camera decreases.
Also the focussing of object at different distance is achieved by slightly altering the separation of the lens from the film.
BETA
