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Deviation of light as it passes through the atmosphere due to variation in air density is called

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A small object $ab$ of size $1\text{mm}$ is kept at a distance of $40\text{cm}$ from a concave mirror of focal length $30\text{cm}$. Then, the size of the image is :

A plano-convex lens is made of material of refractive index $1.6$. The radius of curvature of the curved surface is $60\text{cm}$. The focal length of the lens is



[Assume, surrounding medium to be air]

A point object is placed at a distance of 18 cm from a convex lens on its principal axis. Its image is formed on the other side of the lens at 27 cm. Calculate the focal length of the lens.

The self inductance of solenoid of length $L$, area of cross-section $A$ and having $N$ turns is -



${\mu }_0$ represents the permeability of free space.

The mass and weight of an object on earth are 5kg and 49N respectively. What will be their values on the moon ? Assume that the acceleration due to gravity on the moon is 1/6th of that on the earth .

Y do we feel cold after a hailstorm and not fell cold during or before the hailstorm??

What's is Einsteins famous formula?explain and mention the formula

The mean intensity of radiation on the surface of the Sun is about ${10}^8{\text{Wm}}^{-2}$. The $rms$ value of the corresponding magnetic field is closest to:

We have an electric kettle rated at (60v, 5A). We have a mass of 10 kg that is placed such that the steam in the kettle is used to drive the mass in the horizontal direction. If the kettle runs for 5 minutes.What is the velocity of mass attained?

State Snell’s law of refraction

The armature in an AC generator is turned alternatively due to the current and magnetic field opposing each other but the generator is used to produce electricity by induction so how does it changes direction if no electricity is available in the conductor is the armature turned in an alternative manner manually

Two boxes A and B are connected by ropes A and B as shown in figure. A person is pulling rope A with a horizontal force along a horizontal and rough surface. Choose the correct free body diagram (FBD) of block A.



(If $F_f$= frictional force, $F_g$ = Gravitational force,$F_n$ = Normal force, $T_a$= Tension force applied by rope A, $T_b$= Tension force applied by rope B)

A ray of light is incident on a plane mirror making an angle of ${30}^{\circ }$ with the normal. The angle between reflected ray and the normal for this ray of light will be : (a) ${30}^{\circ }$ (b) ${60}^{\circ }$ (c) $0^{\circ }$ (d) ${60}^{\circ }$

Find the potential difference between A and B $(V_A-V_B)$ for the given circuit

What is the equivalent resistance in the given circuit?

The source of energy of the sun is ______.

The direction of the force on the conductor when the direction of magnetic field and current are given was found to be opposite to the actual direction of the force on the conductor.

Consider the given reasons why the wrong direction was obtained and choose the correct answers:



Statement 1: The middle finger is taken as the direction of force and the thumb is taken as the direction of the current.



Statement 2: The right hand is used instead of the left hand.

Water falls from a height of 50 m. Calculate the rise in temperature of water when it strikes the bottom. Take g = 10 m s^-2 and specific heat capacity of water = 4200 J kg^-1 °C^-1).

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An object is placed at 60 m in front of a concave mirror. If its radius of curvature is 40 m, then the image distance is

For finding the focal length of a convex lens by obtaining the image of a distant object, one should use as the object.

Two lenses having powers +2D and -4D respectively are put together. Power of the combination would be

For a satellite very close to the surface of earth, we get the time period of the satellite equal to

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