1
WB JEE 2023
MCQ (Single Correct Answer)
+1
-0.25
Change Language

A ray of monochromatic light is incident on the plane surface of separation between two media $$\mathrm{X}$$ and $$\mathrm{Y}$$ with angle of incidence '$$\mathrm{i}$$' in medium $\mathrm{X}$ and angle of refraction 'r' in medium Y. The given graph shows the relation between $$\sin \mathrm{i}$$ and $$\sin \mathrm{r}$$. If $$\mathrm{V}_{X}$$ and $$\mathrm{V}_{Y}$$ are the velocities of the ray in media X and Y respectively, then which of the following is true?

WB JEE 2023 Physics - Wave Optics Question 3 English

A
$$\mathrm{V}_{X}=\frac{1}{\sqrt{3}} \mathrm{~V}_{\mathrm{Y}}$$
B
$$\mathrm{V}_{\mathrm{X}}=\sqrt{3} \mathrm{~V}_{\mathrm{Y}}$$
C
Total internal reflection can happen when the light is incident in medium X.
D
$$v_{X}=\sqrt{3} v_{Y}$$, where $$v_{X}$$ and $$v_{Y}$$ are frequencies of the light in medium X and Y respectively.
2
WB JEE 2023
MCQ (Single Correct Answer)
+1
-0.25
Change Language

Three identical convex lenses each of focal length $$\mathrm{f}$$ are placed in a straight line separated by a distance $$\mathrm{f}$$ from each other. An object is located at f/2 in front of the leftmost lens. Then,

WB JEE 2023 Physics - Geometrical Optics Question 4 English

A
Final image will be at f/2 behind the rightmost lens and its magnification will be $$-1$$.
B
Final image will be at f/2 behind the rightmost lens and its magnification will be $$+1$$.
C
Final image will be at f behind the rightmost lens and its magnification will be $$-1$$.
D
Final image will be at f behind the rightmost lens and its magnification will be $$+1$$.
3
WB JEE 2023
MCQ (Single Correct Answer)
+1
-0.25
Change Language

WB JEE 2023 Physics - Wave Optics Question 5 English

X-rays of wavelength $$\lambda$$ gets reflected from parallel planes of atoms in a crystal with spacing d between two planes as shown in the figure. If the two reflected beams interfere constructively, then the condition for maxima will be, (n is the order of interference fringe)

A
$$\mathrm{d\tan\theta=n\lambda}$$
B
$$\mathrm{d\sin\theta=n\lambda}$$
C
$$\mathrm{2d\cos\theta=n\lambda}$$
D
$$\mathrm{2d\sin\theta=n\lambda}$$
4
WB JEE 2023
MCQ (Single Correct Answer)
+1
-0.25
Change Language

If the potential energy of a hydrogen atom in the first excited state is assumed to be zero, then the total energy of n = $$\infty$$ state is,

A
3.4 eV
B
6.8 eV
C
0
D
$$\infty$$
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