Question

Write true or false. Correct the talse statements.
1. A spherical mirror is a part of a hollow glass sphere that is polished on one side.
2. The geometrical centre of a spherical mirror is called its pole.
3. An incident ray passing through the focus of a convex mirror goes undeviated after reflection.
4. A concave mirror is used in solar heaters.
s. A real image is always erect.
6. Light travels faster in air than in water.
7. The ray of light emerging out of a glass slab is always parallel to the incident ray.
8. A prism is a glass block that has a rectangular cross section, formed by three triangular faces.
9. The angle through which the incident ray is deviated by the prism is called the angle of deviation.
10. A rainbow is formed because water droplets of the atmosphere behave like glass slabs.​

Answer 1

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1. FALSE

• Spherical mirror is a piece sliced from large imaginary sphere.

2.TRUE

• Pole is the geometrical centre of spherical mirror

3.TRUE

4.TRUE

• Concave mirrors are used in solar furnaces, because concave mirrors are the only type of mirror that reflects light in toward a single focal point

5 . FALSE

• Real image is always inverted.

6.TRUE

• Speed of light in air is 3×10^8m/s whereas speed of light in water is 2×10^8m/s

7.TRUE

8.TRUE

9.TRUE

10.FALSE

• Rainbow is formed because water droplets in atmosphere behaves like convex lens.

Answer 2

false

true

true

true

false

true

true

true

true

false