A photoelectric cell is a device which:
A photoelectric cell, also known as a photocell or solar cell, is a device that converts light energy into electrical energy through the photoelectric effect. When light strikes the surface of a material (usually a metal), electrons are emitted, creating an electric current. This principle is widely used in solar panels to generate electricity from sunlight. Therefore, it is not a device for storing light or converting electric energy into light.
An object is placed 15 cm in front of a convex lens of focal length 25 cm. The image distance will be
A short object of length L is placed along the principal axis of a concave mirror slightly away from the focus of the mirror (u ≈ f). What will be the length of the image? (symbols carry their usual meanings)
An object X is placed in air in front of a convex refracting surface. Following four sketches are drawn for depicting the situation (symbols carry their usual meanings).
Which of these could be correct sketches?
a)
b)
c)
d)
When white light passes through the prism, the light colours bend differently. Arrange the following colours from the one that bends the least to the one that bends the most :
I. Blue
II. Green
III. Yellow
IV. Orange
Select the correct answer from the codes given below :
The optical phenomena, twinkling of stars, is due to :
The sky appears blue due to :
