Question

A concave mirror forms a real image of an object placed in front of it at a distance

30cm, of size three times the size of the object. Find (a) focal length of the mirror

(b) position of image​

Answer 1

A.

u=−30cm,m=−3,

m=f−uf⇒−3=f−(−30)f=f+30f

⇒−3f−90=f

⇒−4f=90

→f=−490=−245=−22.5cm

B.

u1+v1=f1⇒−301+v1=2−45

v1=[301−452]⇒903−4=90−1

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