Write Snell’s law of refraction of light.
OR
Write two characteristics of the image of an extended object formed when it is placed in between the optical centre and focus of a thin convex lens.
WBBSE
Class X
Physical Science
Light – Reflection and Refraction
02 Mark
2023
Snell’s law : The ratio of the sine of the angle of incidence (i) to the sine of the angle of refraction (r) is a constant, for the light of a given colour and for the given pair of media.
Mathematical form: μ = sin i / sin r
OR
Characteristics of the ImageÂ
- Upright (erect) and Virtual
- Enlarged
Related Questions
More WBBSE Easy level questions
1/12
Q.
Whether a concave lens is called a converging or diverging lens? Answer with reason.
A.
A concave lens is called a diverging lens. Reason: When parallel rays...
Q.
A ray parallel to the principal axis of a concave mirror follows which path after...
A.
A ray that is parallel to the principal axis of a concave...
Q.
Write one use of a convex mirror.
A.
A convex mirror is commonly used as a rearview mirror in vehicles.
Q.
In the case of refraction of white light through a prism, the light of colour...
A.
c. red Explanation: Deviation depends on the refractive index of the medium...
Q.
What is meant by the principal axis of a concave lens?
A.
The principal axis of a concave lens is an imaginary straight line...
Q.
Determine the angle of deviation for the refraction of light rays from rarer to denser...
A.
The angle of deviation (δ) for light rays passing from a rarer...
Q.
Explain with a suitable ray diagram the process of formation of image by a concave...
A.
A concave lens always forms a virtual, erect and diminished image of...
Q.
Why is the red colour selected for danger signal lights?
A.
Red colour is selected for danger signal lights because it has the...
Q.
Explain with a diagram why the sky appears blue.
A.
Sunlight consists of seven colours. As it passes through the Earth's atmosphere,...
Q.
Determine the speed of a light ray passing through a glass slab of refractive index...
A.
Refractive index of glass (μ) = 1.5 Speed of light in vacuum...
Q.
Define dispersion of light. How would you identify monochromatic light and composite light with the...
A.
Dispersion of Light is the phenomenon where light splits into its constituent...
Q.
Write down the relationship between relative refractive index and absolute refractive index. On which factors...
A.
Relative refractive index of medium 2 with respect to medium 1: 1μ2...