Optics

Light, reflection, refraction, lenses, and optical instruments.

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QUESTION NO 01

Total internal reflection occurs when light goes from?

Answer: Denser to rarer medium beyond critical angle

TIR: denser → rarer with i > critical angle.

Shahzad Mahota @shahzad-mahota

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QUESTION NO 02

Myopia is corrected by?

Answer: Concave lens

Nearsightedness is corrected with diverging (concave) lenses.

Shahzad Mahota @shahzad-mahota

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QUESTION NO 03

Primary rainbow is caused by?

Answer: Refraction and reflection in raindrops

Rainbows involve refraction, dispersion, and internal reflection in water drops.

Shahzad Mahota @shahzad-mahota

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QUESTION NO 04

Power of a lens (in dioptres) is?

Answer: 1/f with f in metres

P(D) = 1/f(m).

Shahzad Mahota @shahzad-mahota

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QUESTION NO 05

Dispersion by a prism is due to?

Answer: Wavelength-dependent refractive index

n varies with wavelength, so colours separate.

Shahzad Mahota @shahzad-mahota

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QUESTION NO 06

Total internal reflection occurs when light goes from?

Answer: Denser to rarer medium beyond critical angle

TIR: denser → rarer with i > critical angle.

Shahzad Mahota @shahzad-mahota

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QUESTION NO 07

Critical angle for glass–air is typically around?

Answer: 42°

For n ≈ 1.5 glass to air, c ≈ arcsin(1/1.5) ≈ 42°.

Shahzad Mahota @shahzad-mahota

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QUESTION NO 08

Magnification m for a mirror is?

Answer: −v/u

Lateral magnification m = h′/h = −v/u for mirrors (sign convention dependent).

Shahzad Mahota @shahzad-mahota

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QUESTION NO 09

Focal length of a plane mirror is?

Answer: Infinity

Plane mirrors have f = ∞ (R = ∞).

Shahzad Mahota @shahzad-mahota

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QUESTION NO 10

A convex lens is also called?

Answer: Converging lens

A convex (converging) lens focuses parallel rays to a focal point.

Shahzad Mahota @shahzad-mahota

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Total internal reflection occurs when light goes from?

Myopia is corrected by?

Primary rainbow is caused by?

Power of a lens (in dioptres) is?

Dispersion by a prism is due to?

Total internal reflection occurs when light goes from?

Critical angle for glass–air is typically around?

Magnification m for a mirror is?

Focal length of a plane mirror is?

A convex lens is also called?

Optics

More topics in Physics

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Electricity & Magnetism

Mechanics

Modern Physics

Optics

Thermodynamics

Waves & Sound

Explore

Total internal reflection occurs when light goes from?

Explanation

Myopia is corrected by?

Explanation

Primary rainbow is caused by?

Explanation

Power of a lens (in dioptres) is?

Explanation

Dispersion by a prism is due to?

Explanation

Total internal reflection occurs when light goes from?

Explanation

Critical angle for glass–air is typically around?

Explanation

Magnification m for a mirror is?

Explanation

Focal length of a plane mirror is?

Explanation

A convex lens is also called?

Explanation