Physics-
General
Easy
Question
The values of 
for final rays to be parallel to the principle axis are: (focal lengths of the lenses are written on the lenses)
The correct answer is:
Related Questions to study
physics-
Two convex lenses of focal length f and 2f are arranged to have their foci at the same point as shown in the figure. A beam of parallel light of diameter 1 cm is incident into the first lens. The beam emerging from the second lens is
Two convex lenses of focal length f and 2f are arranged to have their foci at the same point as shown in the figure. A beam of parallel light of diameter 1 cm is incident into the first lens. The beam emerging from the second lens is
physics-General
physics-
Figure shows the behaviour of light rays with respect to a plano-convex lens whose plane surface is silvered as shown in the figure. If the refractive index of the material of the lens is 1.5, th/e radius of curvature of the curved part of the lens is
Figure shows the behaviour of light rays with respect to a plano-convex lens whose plane surface is silvered as shown in the figure. If the refractive index of the material of the lens is 1.5, th/e radius of curvature of the curved part of the lens is
physics-General
physics-
Choose the correct mirror-image of the figure given
Choose the correct mirror-image of the figure given
physics-General
physics-
In the situation shown in the adjacent figure, what is the maximum elongation produced in the spring if initially the spring is relaxed (consider all contact surfaces to be smooth)?
In the situation shown in the adjacent figure, what is the maximum elongation produced in the spring if initially the spring is relaxed (consider all contact surfaces to be smooth)?
physics-General
physics-
A monkey jumps from ball A onto ball B which are suspended from inextensible light string each of length L. The mass of each ball & monkey is same. What should be the minimum relative velocity of jump w.r.t. ball, if both the balls manage to complete the circle?
A monkey jumps from ball A onto ball B which are suspended from inextensible light string each of length L. The mass of each ball & monkey is same. What should be the minimum relative velocity of jump w.r.t. ball, if both the balls manage to complete the circle?
physics-General
physics-
A 5.0 kg block is placed on top of a 10.0 kg block (see figure). A horizontal force of 45 N is applied to the 10 kg block, and the 5.0 kg block is tied to the wall. The coefficient of kinetic friction between the two blocks, and between the blocks and the floor, is 0.2.
A 5.0 kg block is placed on top of a 10.0 kg block (see figure). A horizontal force of 45 N is applied to the 10 kg block, and the 5.0 kg block is tied to the wall. The coefficient of kinetic friction between the two blocks, and between the blocks and the floor, is 0.2.
physics-General
physics-
A certain prism is found to produce a minimum deviation of 
It produces a deviation of 
when the angle of incidence is either 
What is the angle of incidence when it is undergoing minimum deviation?
A certain prism is found to produce a minimum deviation of It produces a deviation of when the angle of incidence is either What is the angle of incidence when it is undergoing minimum deviation?
physics-General
physics-
A ball of mass m is attached to a rigid vertical rod by means of two massless strings with length L. The strings are attached to the rod at points a distance L apart (see Figure). The system is rotating about the axis of the rod, both strings being taut and forming an equilateral triangle. The tension in the upper string is 
A ball of mass m is attached to a rigid vertical rod by means of two massless strings with length L. The strings are attached to the rod at points a distance L apart (see Figure). The system is rotating about the axis of the rod, both strings being taut and forming an equilateral triangle. The tension in the upper string is
physics-General
physics-
The diagram represents a ramp at a skateboard park : a quarter-circle arc of radius R (segment AB) joined to a horizontal section (segment BC). A skateboarder of mass M starts from rest at point A, rolls frictionlessly down arc AB, and collides with his friend (also same mass M) who is standing on the ground at rest at point B. The two people stick together in the collision. They fall over and together slide distance d along the horizontal surface before coming to a stop. The coefficient of kinetic friction along the horizontal segment is 
The diagram represents a ramp at a skateboard park : a quarter-circle arc of radius R (segment AB) joined to a horizontal section (segment BC). A skateboarder of mass M starts from rest at point A, rolls frictionlessly down arc AB, and collides with his friend (also same mass M) who is standing on the ground at rest at point B. The two people stick together in the collision. They fall over and together slide distance d along the horizontal surface before coming to a stop. The coefficient of kinetic friction along the horizontal segment is
physics-General
physics-
A ray of light incident normally on the horizontal face of the slab and just fail to emerge from the diagonal face of the prism. If prism angle 30° refractive index of the prism is
A ray of light incident normally on the horizontal face of the slab and just fail to emerge from the diagonal face of the prism. If prism angle 30° refractive index of the prism is
physics-General
physics-
An object 'O' is kept in air in front of a thin plano convex lens of radius of curvature 10 cm. It's refractive index is 3/2 and the medium towards right of plane surface is water of refractive index 4/3. What should be the distance 'x' of the object so that the rays become parallel finally.
An object 'O' is kept in air in front of a thin plano convex lens of radius of curvature 10 cm. It's refractive index is 3/2 and the medium towards right of plane surface is water of refractive index 4/3. What should be the distance 'x' of the object so that the rays become parallel finally.
physics-General
physics-
In the figure shown, if 
is equal to
In the figure shown, if is equal to
physics-General
physics-
An equiconcave diverging lens of focal length F is cut into two equal halves. The two halves are turned around and joined with some liquid between them. The lens obtained is converging with focal length F. If the refractive index of the liquid is 3 then what is the refractive index of the lens?
An equiconcave diverging lens of focal length F is cut into two equal halves. The two halves are turned around and joined with some liquid between them. The lens obtained is converging with focal length F. If the refractive index of the liquid is 3 then what is the refractive index of the lens?
physics-General
physics-
Two blocks on an inclined slope (angle q) are connected by a rope as shown in the figure. The friction coefficient between the blocks and the slope is m. Someone is pulling a second rope at A so that the two blocks move upwards along the slope with constant speed. Ignore the mass of the ropes.
Two blocks on an inclined slope (angle q) are connected by a rope as shown in the figure. The friction coefficient between the blocks and the slope is m. Someone is pulling a second rope at A so that the two blocks move upwards along the slope with constant speed. Ignore the mass of the ropes.
physics-General
physics-
An equiconcave lens has focal length 10 cm in air. The refractive index of the material of the lens is 1.5. What should be the refractive index of the medium on the other side of the lens so that the image of a real object placed at a distance 10 cm from the lens is formed at infinity?
An equiconcave lens has focal length 10 cm in air. The refractive index of the material of the lens is 1.5. What should be the refractive index of the medium on the other side of the lens so that the image of a real object placed at a distance 10 cm from the lens is formed at infinity?
physics-General
