Q.

Assertion: Focal length of a convex mirror is 20cm. If a real object is placed 20 cm from the mirror, its virtual erect and diminished image will be formed 
Reason: If a virtual object is placed at 20 cm distance behind this convex mirror. Its image is formed at infinity. 

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a

If Assertion is false but the Reason is true

b

If both Assertion and Reason are true and the Reason is correct explanation of the Assertion

c

If Assertion is true, but the Reason is false

d

If both Assertion and Reason are true but Reason is not the correct explanation of Assertion

answer is B.

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