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Forest: Our lifeline

Explain how animals dwelling in the forest help it grow and regenerate.

04/11/2024

Science

7th

Light

The rear view mirror of a car is a plane mirror. A driver is reversing his
car at a speed of 2 m/s. The driver sees in his rear view mirror the
image of a truck parked behind his car. The speed at which the image of
the truck appears to approach the driver will be
(i) 1 m/s (ii) 2 m/s
(iii) 4 m/s (iv) 8 m/s

04/11/2024

Science

7th

Light

David is observing his image in a plane mirror. The distance between
the mirror and his image is 4 m. If he moves 1 m towards the mirror,
then the distance between David and his image will be
(i) 3 m (ii) 5 m
(iii) 6 m (iv) 8 m

04/11/2024

Science

7th

Light

A virtual image larger than the object can be produced by a
(i) concave lens (ii) concave mirror
(iii) convex mirror (iv) plane mirror

04/11/2024

Science

7th

Light

Which type of lens forms always a virtual image?

04/11/2024

Science

7th

Light

Which type of mirror can form a real image?

04/11/2024

Science

7th

Light

Give one use each of a concave and a convex mirror.

04/11/2024

Science

7th

Light

State two differences between a convex and a concave lens.

04/11/2024

Science

7th

Light

What is a virtual image? Give one situation where a virtual image is
formed.

04/11/2024

Science

7th

Light

Find out the letters of English alphabet or any other language known to
you in which the image formed in a plane mirror appears exactly like
the letter itself. Discuss your findings.

04/11/2024

Science

7th