Optics Question 12
Question: Assertion : The focal length of the mirror is f and distance of the object from the focus is u, the magnification of the mirror is f / u. Reason : Magnification $ =\frac{\text{Size of image}}{\text{Size of object}} $
[AIIMS 1994]
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: A
Solution:
Magnification produced by mirror $ m=\frac{I}{O}=\frac{f}{f-u}=\frac{f}{x} $ x is distance from focus.
