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Q.

Assertion: Magnification of a convex mirror is always positive, but that of a concave mirror may be both positive and negative. Reason: It depends on the sign convention chosen.


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a

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion. 

b

Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion. 

c

Assertion is correct but reason is incorrect

d

  Both Assertion and Reason are incorrect 

answer is C.

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Detailed Solution

Concept: We know that  the sign conventions of the  object are always placed above the principal axis. According to the science navigation the object is always placed at the principal axis. And it will always be positive. So according to the sign rule the height of the image is negative. Hence, the option c is correct.
The object height is always +. The image height may be + or - depending on the type of image .. Therefore, according to sign conventions, the height of the image if it is formed down to  the principal axis can be taken as -.
The magnification of the convex mirror is always +, but that of a concave mirror may be both + and -.
Hence, the correct option is 3.
 
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