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PHYSICS

Physics
What type of lens is used in a magnifying glass

Convex
None of these
Concave
Plano-concave

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Physics
Time of exposure required for taking photograph of an object depends upon the

Size of the object
Brightness of the object
Proximity of object
Skill of photographer

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Physics
A concave lens always forms

An image type which depends on lens curvature
A real image
A virtual image
An image type which depends on object characteristics

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Physics
A concave lens always forms an image which is

Virtual and erect
Real and inverted
Virtual and inverted
Real and erect

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Physics
Which one of the following determines the sharpness of image in a camera ?

The aperture
Size of the camera
The focal length of the lens
The exposure time

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