Optics

If you are running towards a plane mirror at a speed of 10cm/s, at what speed does your reflection approach you ?

Rays from sun converge at a point 15 cm in front of concave mirror. Where should the object be placed so that size of its image is equal to the size of the object ?

Which of the following statements is true ?

Light year is a unit of

What is the cause for twinkling of stars?

The speed of light will be the minimum while passing through which of the following?

A Solar Eclipse will take place when

What should be the minimum height of a plane mirror required to view the full image of a person who is 6 feet tall?

The hearing range of human ear is

Which of the following factors does the intensity of light depend on?

A convex lens is dipped in a liquid whose refractive index is equal to the refractive index of the lens. What is its focal length?

The average distance between the earth and the sun is

Which of the following light phenomena confirms the transverse nature of light?

which of the following is the field of view maximum?

A string in a musical instrument is 50cm long and its fundamental frequency is 800Hz. If a frequency of 1000Hz is to be produced, then what is the required length of string? (Answer to be provided in cm)

An organ pipe closed at one end has a fundamental frequency of 1500Hz. What is the maximum number of overtones generated by this pipe, which a normal person can hear?

At resonance air column of length 20cm resonate with a tuning fork of frequency 450 Hz. ignoring end correction, the velocity of sound in air is? (Answer to be given in m/s)

Standing waves are produced in 10m long stretched string. If the string vibrates in 5 segments and wave velocity is 20m/s, its frequency is? (Answer to be given in Hz)

Under what condition, does a biconvex lens of glass having a certain refractive index act as a plane glass sheet when immersed in a liquid?

The speed of sound waves is maximum in _____ .