Question

Mention any four device that contain concave lens

Answer 1

See the attached photo ....

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Also in short points :

1. Telescope

2. Binoculars

3. Spectacles

4. Lasers

5. Cameras

6. Flashlights

7. Peepholes

Answer 2

Some devices that make use of the convex lens are mentioned below:

• Magnifying glass: for magnification of objects.

• Microscopes: again for magnifying objects which cannot be seen by the naked eyes.

• Cameras: They help in zooming and magnification too.

• Telescopes: Used for seeing objects bigger in the night sky.