1
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 1 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 $$+1$$.
2
WB JEE 2023
MCQ (Single Correct Answer)
+1
-0.25
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WB JEE 2023 Physics - Wave Optics Question 3 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
$$\mathrm{2d\sin\theta=n\lambda}$$
3
WB JEE 2023
MCQ (Single Correct Answer)
+1
-0.25
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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
$$\infty$$
4
WB JEE 2023
MCQ (Single Correct Answer)
+1
-0.25
Change Language

WB JEE 2023 Physics - Electronic Devices Question 2 English

In the given circuit, find the voltage drop $$\mathrm{V_L}$$ in the load resistance $$\mathrm{R_L}$$.

A
5 V
B
3 V
C
9 V
D
6 V
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