1
WB JEE 2018
MCQ (Single Correct Answer)
+1
-0.25
Change Language
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$$\sqrt {3} $$
2
WB JEE 2018
MCQ (Single Correct Answer)
+1
-0.25
Change Language
WB JEE 2018 Physics - Geometrical Optics Question 8 English
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
3
WB JEE 2018
MCQ (Single Correct Answer)
+1
-0.25
Change Language
There is a small air bubble at the centre of a solid glass sphere of radius r and refractive index $$\mu$$. What will be the apparent distance of the bubble from the centre of the sphere, when viewed from outside?
A
r
B
$${r \over \mu }$$
C
$$r\left( {1 - {1 \over \mu }} \right)$$
D
Zero
4
WB JEE 2017
MCQ (Single Correct Answer)
+1
-0.25
Change Language
The ratio of the diameter of the sun to the distance between the earth and the sun is approximately 0.009. The approximate diameter of the image of the sun formed by concave spherical mirror of radius of curvature 0.4 m is
A
4.5 $$ \times $$ 10$$-$$6 m
B
4.0 $$ \times $$ 10$$-$$6 m
C
3.6 $$ \times $$ 10$$-$$3 m
D
1.8 $$ \times $$ 10$$-$$3 m
WB JEE Subjects
EXAM MAP
Medical
NEET
Graduate Aptitude Test in Engineering
GATE CSEGATE ECEGATE EEGATE MEGATE CEGATE PIGATE IN
CBSE
Class 12