1
JEE Main 2020 (Online) 8th January Evening Slot
+4
-1
An object is gradually moving away from the focal point of a concave mirror along the axis of the mirror. The graphical representation of the magnitude of linear magnification (m) versus distance of the object from the mirror (x) is correctly given by :
(Graphs are drawn schematically and are not to scale)
A
B
C
D
2
JEE Main 2020 (Online) 8th January Morning Slot
+4
-1
The magnifying power of a telescope with tube 60 cm is 5. What is the focal length of its eye piece ?
A
40 cm
B
10 cm
C
30 cm
D
20 cm
3
JEE Main 2020 (Online) 8th January Morning Slot
+4
-1
The critical angle of a medium for a specific wavelength, if the medium has relative permittivity 3 and relative permeability $${4 \over 3}$$ for this wavelength, will be :
A
45°
B
15°
C
30°
D
60°
4
JEE Main 2020 (Online) 7th January Evening Slot
+4
-1
A thin lens made of glass (refractive index = 1.5) of focal length f = 16 cm is immersed in a liquid of refractive index 1.42. If its focal length in liquid is f1 , then the ratio $${{{f_1}} \over f}$$ is closest to the integer :
A
17
B
1
C
9
D
5
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