Determine the angle of deviation for the refraction of light rays from rarer to denser medium. [2]
(angle of incidence = i, angle of refraction = r)
OR
Why do the green leaves of trees appear ‘green’ in sunlight? [2]
WBBSE
Class X
Physical Science
Light – Reflection and Refraction
02 Mark
2022
The angle of deviation (δ) for light rays passing from a rarer to a denser medium is given by:
δ = i−r
Where:
- i is the angle of incidence,
- r is the angle of refraction.
OR
Green leaves appear green because they contain a pigment called chlorophyll, which absorbs most of the blue and red wavelengths of light and reflects the green wavelength. Since green light is reflected, it is the colour we see.
Related Questions
More WBBSE Easy level questions
1/12
Q.
What type of lens is used as a magnifying glass?
A.
Convex lens Explanation: Convex lens forms virtual, erect, magnified image for objects...
Q.
Which type of mirror produces virtual, diminished and erect image?
A.
(c) Convex mirror Explanation: A convex mirror always forms an image which...
Q.
Which parameter remains unaltered during refraction of light?
A.
(c) Frequency Explanation: During refraction, a light ray bends because its speed...
Q.
Write the names of two bio-degradable polymers.
A.
Examples of biodegradable polymers : Polylactic acid (PLA) Polyhydroxybutyrate (PHB)
Q.
Explain the difference between minerals and ores.
A.
Minerals Ores Minerals are naturally occurring substances found in the Earth’s crust....
Q.
Name two copper containing alloys. State one use of each alloy.
A.
Two copper alloys: Copper Alloy Composition Uses Brass Copper (Cu): 60–80% Zinc...
Q.
For which value of the angle of incidence in refraction of light is Snell’s law...
A.
Snell’s law is not applicable when the angle of incidence is 0°.
Q.
How can the given conversion be carried out?
A.
The given conversion of ethene (H₂C = CH₂) to ethane (H₃C –...
Q.
What is now used in electrical circuits instead of fuse wire?
A.
MCB / Miniature circuit breaker
Q.
Name the greenhouse gas discharged from a refrigerator.
A.
CFC / HFC
Q.
Which layer of atmosphere is susceptible to storm and rain?
A.
Troposphere Explanation: Troposphere is the lowest layer nearest to Earth's surface, where...
Q.
Which metal is used as catalyst in Haber’s process for preparation of ammonia?
A.
The metal used as a catalyst in the Haber’s process for the...