Light & Optics MCQs with Answers

Objects that allow light to travel through them are called?

• A.Opaque
• B.Transparent
• C.Translucent
• D.Reflective

Least distance of distinct vision for a person with hypermetropia is _?

• A.25 cm
• B.Less than 25 cm
• C.More than 25 cm
• D.At infinity

The straight line passing through the pole (P) and the center of curvature (C) of a mirror is called the _ of that mirror.

• A.Normal Line
• B.Focal Plane
• C.Principal Axis
• D.Optical Center

Which technique is used to distinguish between imitation and pure diamond?

• A.Hardness test
• B.Specific gravity
• C.Thermal conductivity
• D.Refractive index

Concave lenses are also known as ?

• A.Converging Lens
• B.Diverging Lens
• C.Plano-convex Lens
• D.Cylindrical Lens

The colour of an opaque or non-luminous object is the colour of light it _?

• A.Absorbs
• B.Reflects
• C.Refracts
• D.Transmits

Past Paper MCQ

What material are the optical fibres used in fibre optics made of?

• A.Copper
• B.Glass
• C.Plastic
• D.Aluminium

If the wavelength of a photon is doubled, then _.

• A.Energy remains unchanged
• B.Energy is doubled
• C.Energy is reduced by the factor of two
• D.Energy becomes four times

If there would be no sun the color of the sky would be ?

• A.Blue
• B.White
• C.Black
• D.Red

Convex lens is in the center?

• A.Thick
• B.Thin
• C.Uniform
• D.Hollow