EASY
10th CBSE
IMPORTANT
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When sunlight is concentrated on a piece of paper by a spherical mirror or lens, then a hole can be burnt in it. For doing this, the paper must be placed at the focus of:

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Important Questions on Refraction of Light

EASY
10th CBSE
IMPORTANT

A beam of parallel light rays is incident through the holes on one side of a box and emerges out through the holes on its opposite side as shown in the diagram below.

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Which of the following could be inside the box?

EASY
10th CBSE
IMPORTANT

A beam of light is incident through the holes on one side of a box and emerges out through the holes on its opposite side as shown in the following figure.

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The box contains:

EASY
10th CBSE
IMPORTANT
Which of the following can form a virtual image which is always smaller than the object?
MEDIUM
10th CBSE
IMPORTANT

When an object is placed 10 cm in front of lens A, the image is real, inverted, magnified and formed at a great distance. When the same object is placed 10 cm in front of lens B, the image formed is real, inverted and same size as the object.

What is the focal length of lens A?

EASY
10th CBSE
IMPORTANT

When an object is placed 10 cm in front of lens A, the image is real, inverted, magnified and formed at a great distance. When the same object is placed 10 cm in front of lens B, the image formed is real, inverted and same size as the object.

What is the focal length of lens B?

EASY
10th CBSE
IMPORTANT

When an object is placed 10 cm in front of lens A, the image is real, inverted, magnified and formed at a great distance. When the same object is placed 10 cm in front of lens B, the image formed is real, inverted and same size as the object.

What is the nature of lens A?

EASY
10th CBSE
IMPORTANT

When an object is placed 10 cm in front of lens A, the image is real, inverted, magnified and formed at a great distance. When the same object is placed 10 cm in front of lens B, the image formed is real, inverted and same size as the object.

What is the nature of lens B?

EASY
10th CBSE
IMPORTANT

When a fork is seen through lenses A and B one by one, it appears as shown in the diagrams. What is the nature of (i) lens A and (ii) lens B? Give reason for your answer.

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