NEET Refraction by Plane Surfaces MCQs & PYQs

Practice NEET Refraction by Plane Surfaces Questions

Question 11:

moderate

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R.

Assertion A: The mass density of an optically denser medium is greater than that of an optically rarer medium.

Reason R: Optical density is found by the ratio of the speed of light in two media while mass density is mass per unit volume.

In the light of the above statements, choose the correct answer from the option given below.

Mass density and optical density are not directly related. For example, oil is optically denser than water but has a lower mass density. Thus, Assertion A is false but Reason R is true.

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Question 12:

moderate

If a container of height \(17.3\text{ cm}\) is filled with a liquid of refractive index \(\mu\). The bottom of container appear to be raised by \(3.46\text{ cm}\) when seen from above. Refractive index of liquid is

The apparent shift is \(s = d\left(1 - \frac{1}{\mu}\right)\). Substituting the values: \(3.46 = 17.3 \left(1 - \frac{1}{\mu}\right) \implies 1 - \frac{1}{\mu} = 0.2 \implies \mu = 1.25\).

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Question 13:

moderate

A beam of light composed of red and green rays is incident obliquely at a point on the face of a rectangular glass slab. When coming out on the opposite parallel face, the red and green rays emerge from:

(2004)

When composite light is incident obliquely on a parallel-sided glass slab, different colors undergo different refraction angles due to dispersion.
They suffer different lateral shifts but emerge parallel to the incident ray direction.
Thus, red and green rays emerge from two points propagating in two different parallel directions.

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