General Science Class 7

The angle of incidence of a ray for which the angle of refraction is 90° is called:

1. Refracted Angle
2. Critical Angle
3. Incident Angel
4. Angle of Deviation

Total internal reflection of light is possible when light enters from:

1. Air to water
2. Glass to glass
3. Water to air
4. Air to glass

Reflecting prisms usually work on the principle of total:

1. Internal Reflection
2. External Reflection
3. Refraction
4. Diffraction

Periscope is another optical instrument that works on the principle of total:

1. Refraction
2. Diffraction
3. External Reflection
4. Internal Reflection

Binocular work on the principle of which one of the following?

1. Refraction of Light
2. Diffraction of Light
3. Total Internal Reflection of Light
4. Transmission of Sound

A binocular uses _____ prisms to see distant objects.

1. Porro
2. Schmidt
3. Fresnel
4. Kepler

Which prism in one of the most commonly used dispersive prisms?

1. Rectangular
2. Triangular
3. Square
4. Pentagonal

The splitting of white light into its component colours is called:

1. Refraction of light
2. Reflection of light
3. Dispersion of light
4. Diffraction of light

When light passes through prism _____ occurs to form spectrum.

1. Refraction
2. Reflection
3. Diffraction
4. None

The primary colors of light are:

1. 2
2. 3
3. 4
4. 5