1
WB JEE 2021
+1
-0.25
A spherical convex surface of power 5 D separates object and image space of refractive indices 1.0 and $$4\over3$$ , respectively. The radius of curvature of the surface is
A
20 cm
B
1 cm
C
4 cm
D
5 cm
2
WB JEE 2021
+1
-0.25

The cross-section of a reflecting surface is represented by the equation x2 + y2 = R2 as shown in the figure. A ray travelling in the positive x-direction is directed toward positive y-direction after reflection from the surface at point M. The coordinate of the point M on the reflecting surface is
A
$$\left( {{R \over {\sqrt 2 }},{R \over {\sqrt 2 }}} \right)$$
B
$$\left( { - {R \over 2}, - {R \over 2}} \right)$$
C
$$\left( { - {R \over {\sqrt 2 }},{R \over {\sqrt 2 }}} \right)$$
D
$$\left( {{R \over {\sqrt 2 }}, - {R \over {\sqrt 2 }}} \right)$$
3
WB JEE 2020
+1
-0.25
A tennis ball hits the floor with a speed v at an angle $$\theta$$ with the normal to the floor. If the collision is inelastic and the coefficient of restitution is $$\varepsilon$$, what will be the angle of reflection?
A
$${\tan ^{ - 1}}\left( {{{\tan \theta } \over \varepsilon }} \right)$$
B
$${\sin ^{ - 1}}\left( {{{\sin \theta } \over \varepsilon }} \right)$$
C
$$\theta$$$$\varepsilon$$
D
$$\theta {{2\varepsilon } \over {\varepsilon + 1}}$$
4
WB JEE 2020
+1
-0.25
An object, is placed 60 cm in front of a convex mirror of focal length 30 cm. A plane mirror is now placed facing the object in between the object and the convex mirror such that it covers lower half of the convex mirror. What should be the distance of the plane mirror from the object, so that there will be no parallax between the images formed by the two mirrors?
A
40 cm
B
30 cm
C
20 cm
D
15 cm
EXAM MAP
Medical
NEET