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An object is placed at infinity in front of aconcave mirror of radius off curvature 40cm. The image will be formed in front of themirror a distance of:0 20 cm0 30 cm040cmO 50 cm​

Answer»

Answer:

20 cm

Explanation:

Since the OBJECT is at INFINITY the image is FORMED at the focus .

we can confirm that by the mirror formula

1/f = 1/u +1/v

here u= infinity f=R/2 =40/2 = 20

1/20 = 1/infinity +1/v

since 1/infinity is ZERO

1/20 = 1/V

v= 20 cm



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