Light & Optics MCQs with Answers

The color that is least deviated by a prism ?

• A.Violet ray
• B.Green ray
• C.Red ray
• D.Yellow ray

A Periscope uses two plane mirrors one above the other at ?

• A.45°
• B.60°
• C.90°
• D.30°

The focal length of a convex lens is 10 cm. At what distance should an object be placed to get an image twice the size of the object?

• A.5 cm
• B.10 cm
• C.15 cm
• D.20 cm

We can see most objects because they _?

• A.Absorb light
• B.Emit light
• C.Reflect light
• D.Refract light

The speed of light (c) in vacuum is approximately?

• A.3 × 10⁶ m/s
• B.3 × 10⁸ m/s
• C.3 × 10¹⁰ m/s
• D.3 × 10⁴ m/s

Past Paper MCQ

Which of the following are considered primary colours?

• A.Red, yellow, blue
• B.Red, blue, green
• C.Yellow, cyan, magenta
• D.Orange, green, violet

A virtual image is one _?

• A.From which light rays diverge but do not pass through
• B.From which light rays converge and pass through
• C.Which is always inverted and smaller than the object
• D.Which can be obtained directly on a screen

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

• A.Diffraction
• B.Refraction
• C.Dispersion
• D.Internal Reflection

When light enters from vacuum into glass, its velocity?

• A.First increases then decreases
• B.Increases
• C.Remains the same
• D.Decreases

Which type of lens is thinner at the centre than at the edges?

• A.Convex lens
• B.Cylindrical lens
• C.Plano-convex lens
• D.Concave lens