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1
COMEDK 2025 Afternoon Shift
MCQ (Single Correct Answer)
+1
-0
When a body of refractive index $\boldsymbol{\mu}=\mathbf{1 . 4}$ is put into a liquid, the body becomes invisible. What would be the refractive index of the medium?
A
$\mu=1$
B
$\mu=0.7$
C
$\mu=2.4$
D
$\mu=1.4$
2
COMEDK 2025 Afternoon Shift
MCQ (Single Correct Answer)
+1
-0
A ray of light is travelling from glass of refractive index $\frac{3}{2}$ to water of refractive Index $\frac{4}{3}$. What is the minimum angle of incidence for which no light enters in to the water?
A
$i_c=\sin ^{-1}\left(\frac{9}{8}\right)$
B
$i_c=\sin ^{-1}\left(\frac{8}{9}\right)$
C
$i_c=\sin ^{-1}\left(\frac{2}{3}\right)$
D
$i_c=\sin ^{-1}\left(\frac{1}{2}\right)$
3
COMEDK 2025 Afternoon Shift
MCQ (Single Correct Answer)
+1
-0
The focal lengths of the objective and eyepiece of a compound microscope are 1 cm and 10 cm respectively. Length of the tube is 25 cm . If the final image is formed at infinity , the magnifying power of the microscope is :
A
70
B
35
C
7.0
D
3.5
4
COMEDK 2025 Afternoon Shift
MCQ (Single Correct Answer)
+1
-0
What is the velocity of light in vacuum if the velocity of light in a medium of refractive index 1.2 is ' v ' $\mathrm{ms}^{-1}$ ?
A
$\left(\frac{v}{1.2}\right) m s^{-1}$
B
$(2.4 v) \mathrm{ms}^{-1}$
C
$(1.2 v) \mathrm{ms}^{-1}$
D
$3 \times 10^8 \mathrm{~ms}^{-1}$
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