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Note: Focal length formula=1/f=[1/v]-[1/u]
Answer:
a].
a).f=30cm
b).f=60cm
c).f=infinite
d).f=-60cm
e).f=-21.42cm
b]
Option C is incorrect.
Because the image is formed only within this u and v points.That is the parallel rays entering into focal distance only forms image.At focal point ,the image is a point.
C].For this,plane mirror may also produces same size of image and object.
In some special case,concave mirror forms this phenomenon.
c]
Explanation:
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