1
WB JEE 2017
MCQ (Single Correct Answer)
+1
-0.25
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A point object is held above a thin equiconvex lens at its focus. The focal length is 0.1 m and the lens rests on a horizontal thin plane mirror. The final image will be formed at
A
infinite distance above the lens
B
0.1 m above the center of the lens
C
infinite distance below the lens
D
0.1 m below the center of the lens
2
WB JEE 2017
MCQ (Single Correct Answer)
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WB JEE 2017 Physics - Geometrical Optics Question 14 English
A parallel beam of light is incident on a glass prism in the shape of a quarter cylinder of radius R = 0.05 m and refractive index n = 1.5, placed on a horizontal table as shown in the figure. Beyond the cylinder, a patch of light is found whose the nearest distance x from the cylinder is
A
$$(3\sqrt 3 - 4) \times {10^{ - 2}}$$ m
B
$$(2\sqrt 3 - 2) \times {10^{ - 2}}$$ m
C
$$(3\sqrt 5 - 5) \times {10^{ - 2}}$$ m
D
$$(3\sqrt 2 - 3) \times {10^{ - 2}}$$ m
3
WB JEE 2017
MCQ (Single Correct Answer)
+1
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The de-Broglie wavelength of an electron is $$0.4 \times {10^{ - 10}}$$ m when its kinetic energy is 1.0 keV. Its wavelength will be $$1.0 \times {10^{ - 10}}$$ m, when its kinetic energy is
A
0.2 keV
B
0.8 keV
C
0.63 keV
D
0.16 keV
4
WB JEE 2017
MCQ (Single Correct Answer)
+1
-0.25
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When light of frequency v1 is incident on a metal with work function W (where hv1 > W), then photocurrent falls to zero at a stopping potential of V1. If the frequency of light is increased to v2, the stopping potential changes to V2. Therefore, the charge of an electron is given by
A
$${{W({v_2} + {v_1})} \over {{v_1}{V_2} + {v_2}{V_1}}}$$
B
$${{W({v_2} + {v_1})} \over {{v_1}{V_1} + {v_2}{V_2}}}$$
C
$${{W({v_2} - {v_1})} \over {{v_1}{V_2} - {v_2}{V_1}}}$$
D
$${{W({v_2} - {v_1})} \over {{v_2}{V_2} - {v_1}{V_1}}}$$
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