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Swati Satishwar Cherian
Asked: 2022-11-06T06:46:46+05:30 In:

The focal length of a concave mirror is 50cm. Where an object be placed so that its image is two times and inverted
A. 75 cm
B. 72 cm
C. 63 cm
D. 50 cm

The focal length of a concave mirror is 50cm. Where an object be placed so that its image is two times and inverted
A. 75 cm
B. 72 cm
C. 63 cm
D. 50 cm
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  1. Correct Answer – a

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Aarti Buch
Asked: 2022-11-04T14:22:59+05:30 In:

The focal length of a concave mirror is 50cm. Where an object be placed so that its image is two times and inverted
A. 75 cm
B. 60 cm
C. 125 cm
D. 50 cm

The focal length of a concave mirror is 50cm. Where an object be placed so that its image is two times and inverted
A. 75 cm
B. 60 cm
C. 125 cm
D. 50 cm
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  1. Correct Answer – A
    (a) In case of concave mirror, m=-2
    Also, `m=(f)/(f-u)`
    `rArr -2=(-50)/(-50-u)`
    `therefore` Distance of the object from the mirror u = -75 cm

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Babita Madan
Asked: 2022-11-03T20:35:21+05:30 In:

The focal length of a concave mirror is 50cm. Where an object be placed so that its image is two times and inverted
A. 55cm
B. `-75cm`
C. 65cm
D. 85cm

The focal length of a concave mirror is 50cm. Where an object be placed so that its image is two times and inverted
A. 55cm
B. `-75cm`
C. 65cm
D. 85cm
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  1. Correct Answer – B
    Magnification,`m=(f)/(f-u)`
    Hence, `m=-2 and f=-50cm`
    `-2=(-50)/(-50-u) Rightarrow100+2u=-50`
    or `u=(-150)/(2)=-75cm`

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