(A) Let the side of the glass cube be $L = 21 \ cm$. Let the actual distance of the air bubble from the first face be $x$. Then,its distance from the

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

(A) Let the side of the glass cube be $L = 21 \ cm$. Let the actual distance of the air bubble from the first face be $x$. Then,its distance from the opposite face is $(L - x)$.When viewed from the first face,the apparent distance is $d_1 = x / \mu = 8 \ cm$,so $x = 8\mu$.When viewed from the opposite face,the apparent distance is $d_2 = (L - x) / \mu = 6 \ cm$,so $L - x = 6\mu$.Adding the two equations: $x + (L - x) = 8\mu + 6\mu$,which gives $L = 14\mu$.Given $L = 21 \ cm$,we have $21 = 14\mu$,so $\mu = 21 / 14 = 1.5$.Substituting $\mu = 1.5$ into $x = 8\mu$,we get $x = 8 \times 1.5 = 12 \ cm$.

Class 12 Physics Ray Optics and Optical Instruments Refraction through Plane Surface and Glass Slab

Medium

$A$ glass cube of length $21 \ cm$ has a small air bubble trapped inside. When viewed normally from one face,its apparent distance is $8 \ cm$. When viewed normally from the opposite face,its apparent distance is $6 \ cm$. The refractive index of the glass and the actual distance of the air bubble from the first surface respectively are:

MHT CET 2025 All MHT CET

A
$1.5, 12 \ cm$
B
$1.55, 14 \ cm$
C
$1.6, 11 \ cm$
D
$1.5, 9 \ cm$

Explore More

Browse All

Question Bank

All Subjects

Class 12 Questions

Class 12

Physics Questions

Chapter

Ray Optics and Optical Instruments

Subtopic

Refraction through Plane Surface and Glass Slab

Previous Year

MHT CET 2025 Paper All MHT CET years →

Three immiscible transparent liquids with refractive indices $3/2, 4/3$ and $6/5$ are arranged one above the other in a container. The depths of the liquids are $3 \text{ cm}, 4 \text{ cm}$ and $6 \text{ cm}$ respectively. The apparent depth of the vessel is (in $\text{ cm}$)

MediumMHT CET 2025

View Solution

Two light rays initially in the same phase travel through two media of equal length $L$ having refractive indices $\mu_1$ and $\mu_2$ (where $\mu_1 > \mu_2$) as shown in the figure. If the wavelength of the light rays in air is $\lambda$,the phase difference of the emerging rays is given by:

Medium

View Solution

Consider the situation shown in the figure. Water $\left( \mu_w = \frac{4}{3} \right)$ is filled in a beaker up to a height of $10 \, cm$. $A$ plane mirror is fixed at a height of $5 \, cm$ from the surface of the water. The distance of the image from the mirror after reflection of an object $O$ at the bottom of the beaker is......$cm$.

Medium

View Solution

Two parallel rays of red and violet colour pass through a glass slab. Which of the following is correct?

Medium

View Solution

$A$ glass slab of thickness $6.0 \text{ cm}$ is placed on a piece of paper on which an ink dot is marked. By how much distance would the ink dot appear to be raised (in $\text{ cm}$)? The velocity of light in glass is $2 \times 10^8 \text{ m/s}$ and that in air is $3 \times 10^8 \text{ m/s}$.

DifficultMHT CET 2026

View Solution

Vedclass Products

For Students

Vedclass Test Series

Mock tests in real JEE/NEET style with performance analysis. 5-day free trial.

Start Free Trial

For Teachers

Exam Paper Generator

Generate Set A/B/C/D exam papers from 7.5L+ questions in 2 minutes. 3 chapters free.

Try Free

For Institutes

Online Exam Module

Live online exams with unlimited students, 360° analytics & white-label branding.

See Demo

Similar Questions

Three immiscible transparent liquids with refractive indices $3/2, 4/3$ and $6/5$ are arranged one above the other in a container. The depths of the liquids are $3 \text{ cm}, 4 \text{ cm}$ and $6 \text{ cm}$ respectively. The apparent depth of the vessel is (in $\text{ cm}$)

Two light rays initially in the same phase travel through two media of equal length $L$ having refractive indices $\mu_1$ and $\mu_2$ (where $\mu_1 > \mu_2$) as shown in the figure. If the wavelength of the light rays in air is $\lambda$,the phase difference of the emerging rays is given by:

Two parallel rays of red and violet colour pass through a glass slab. Which of the following is correct?

$A$ glass slab of thickness $6.0 \text{ cm}$ is placed on a piece of paper on which an ink dot is marked. By how much distance would the ink dot appear to be raised (in $\text{ cm}$)? The velocity of light in glass is $2 \times 10^8 \text{ m/s}$ and that in air is $3 \times 10^8 \text{ m/s}$.

Vedclass Test Series

Exam Paper Generator

Online Exam Module