1
MHT CET 2020 19th October Evening Shift
MCQ (Single Correct Answer)
+1
-0

By increasing the aperture of the objective lens, wavelength of light, focal length of the objective lens and the resolving power of an astronomical telescope respectively

A
is not affected, increases, increases
B
decreases, increases, is not affected
C
increases, decreases, is not affected
D
is not affected, increases, decreases
2
MHT CET 2020 16th October Evening Shift
MCQ (Single Correct Answer)
+1
-0

There are four convex lenses $$L_1, L_2, L_3$$ and $$L_4$$ of focal length $$2,4,6$$ and 8 cm, respectively. Two of these lenses from a telescope of length 10 cm and magnifying power 4. The objective and eye lenses are respectively

A
$$L_1, L_2$$
B
$$L_1, L_4$$
C
$$L_2, L_3$$
D
$$L_4, L_1$$
3
MHT CET 2020 16th October Evening Shift
MCQ (Single Correct Answer)
+1
-0

Refractive index of the medium is $$\mu$$ and wavelength is $$\lambda$$, then which of the following proportionality relation is correct?

A
$$\mu \propto \lambda^2$$
B
$$\mu \propto \frac{1}{\lambda}$$
C
$$\mu \propto \lambda$$
D
$$\mu \propto \frac{1}{\lambda^2}$$
4
MHT CET 2020 16th October Evening Shift
MCQ (Single Correct Answer)
+1
-0

A ray of light travelling through glass of refractive index $$\sqrt{2}$$ is incident on glass-air boundary at an angle of incidence $$45^{\circ}$$. If refractive index of air is 1 , then the angle of refraction will be $$\left[\sin 45^{\circ}=\frac{1}{\sqrt{2}}, \sin 90^{\circ}=1\right]$$

A
$$45^{\circ}$$
B
$$30^{\circ}$$
C
$$60^{\circ}$$
D
$$90^{\circ}$$
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