The power of a lens of focal length 50 cm is
Kerosene floats on water that means it is lighter than water, but
Two thin lenses of power +3.5 D and -2.5 D are placed in contact. Find the focal length of the lens combination.
The mirror used in the construction of shaving glass is
Rahul is standing in front of a plane mirror. The distance between Rahul and his image is 150cm. If Rahul’s distance from the mirror is x. What could be the possible value of x?
Light travels faster in substance X as compared to substance Y, then refractive index is greater for
The bending of light ray due to change in its speed is
A medium through which light propagates easily is a
Drop of water behaves likes a
An object is 9 cm from a magnifying lens and its image is formed 36 cm from the lens. Magnification of the lens is.
A person having myopic eyes uses a concave lens of focal length 50 cm. What is the power of the lens?
A doctor has prescribed a corrective lens of power +1.5 D to one of his patients. The focal length and the nature of the lens is
In order to get a diminished and virtual image, the object can be placed anywhere in front of a:
An object is placed 10 cm from a diverging lens which forms an image 6.5 cm from the lens. What is the focal length of the lens?
How many foci does a lens have?
The image formed by plane mirror is
Where should an object be placed in front of a convex lens to get a real image of the size of the object?
A student obtained a sharp image of a burning candle, placed at the farther end of a laboratory table, on a screen using a concave mirror. For getting a better value of focal length of the mirror, what should the student do?
SI unit of power of lens is
Which one of the following materials cannot be used to make lens?
Which one is correct as the new cartesian sign conventions?
The maximum image distance in case of a concave lens of focal length ‘f’ is :
The unit of linear magnification is
A ray of light incident on the optical centre of a spherical lens, after refraction passes through:
Light enters from air to glass plate having refractive index 1.5. The speed of light in glass is