1
WB JEE 2019
+1
-0.25 A ray of light is reflected by a plane mirror. $${\widehat e_0}$$, $$\widehat e$$ and $$\widehat n$$ be the unit vectors along the incident ray, reflected ray and the normal to the reflecting surface respectively.

Which of the following gives an expression for $$\widehat e$$? A
$${\widehat e_0} + 2({\widehat e_0}.\,\widehat n)\widehat n$$
B
$${\widehat e_0} - 2({\widehat e_0}.\,\widehat n)\widehat n$$
C
$${\widehat e_0} - ({\widehat e_0}.\,\widehat n)\widehat n$$
D
$${\widehat e_0} + ({\widehat e_0}.\,\widehat n)\widehat n$$
2
WB JEE 2019
+1
-0.25 A point object is placed on the axis of a thin convex lens of focal length 0.05 m at a distance of 0.2 m from the lens and its image is formed on the axis. If the object is now made to oscillate along the axis with a small amplitude of A cm, then what is the amplitude of oscillation of the image?

[you may assume, $${1 \over {1 + x}} \approx 1 - x$$, where x < < 1]
A
$${{4A} \over 9} \times {10^{ - 2}}$$ m
B
$${{5A} \over 9} \times {10^{ - 2}}$$ m
C
$${A \over 3} \times {10^{ - 2}}$$ m
D
$${A \over 9} \times {10^{ - 2}}$$ m
3
WB JEE 2018
+1
-0.25 A point source is placed at coordinates (0, 1) in xy-plane. A ray of light from the source is reflected on a plane mirror placed along the X-axis and perpendicular to the xy-plane. The reflected ray passes through the point (3, 3). What is the path length of the ray from (0, 1) to (3, 3)?
A
5
B
$$\sqrt {13}$$
C
2$$\sqrt {3}$$
D
1 + 2$$\sqrt {3}$$
4
WB JEE 2018
+1
-0.25  Two identical equiconvex lenses, each of focal length f are placed side by side in contact with each other with a layer of water in between them as shown in the figure. If refractive index of the material of the lenses is greater than that of water, how the combined focal length F is related to f?
A
F > f
B
$${f \over 2} < F < f$$
C
$$F < {f \over 2}$$
D
F = f
WB JEE Subjects
Physics
Mechanics
Electricity
Optics
Modern Physics
Chemistry
Physical Chemistry
Inorganic Chemistry
Organic Chemistry
Mathematics
Algebra
Trigonometry
Coordinate Geometry
Calculus
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