Q1.
In the following diagram showing dispersion of white light by a glass prism, the colours ‘P’ and ‘Q’ respectively are –
(a) Red and Violet
(b) Violet and Red
(c) Red and Blue
(d) Orange and Green
CBSE 2023(31/6/1)
Q2.
An old person is suffering from an eye defect caused by weakening of ciliary muscles and diminishing flexibility of the eye lens. If the defect of vision is ‘a’ which can be corrected by lens ‘b’, then ‘a’ and ‘b’ respectively are :
(a) hypermetropia and convex lens
(b) presbyopia and bifocal lens
(c) myopia and concave lens
(d) myopia and bifocal lens
CBSE 2025(31/1/1)
Q3.
The white light entering a glass prism, gets split into its constituent colours. It is observed that :
(a) Red light deviates the most.
(b) Violet light deviates the least.
(c) Yellow light deviates more than the blue light.
(d) Green light deviates more than the orange light.
CBSE 2025(31/1/2)
Q4.
Consider the following statements in the context of human eye:
(a) The diameter of the eye ball is about 2.3 cm.
(b) Iris is a dark muscular diaphragm that controls the size of the pupil.
(c) Most of the refraction for the light rays entering the eye occurs at the crystalline lens.
(d) While focusing on the objects at different distances the distance between the crystalline lens and the retina is adjusted by ciliary muscles.
The correct statements are –
(A) (a) and (b)
(B) (b), (c) and (d)
(C) (a), (b) and (c)
(D) (a), (c) and (d)
CBSE 2023(31/6/1)
Q5.
In the given figure the angle of incidence and angle of deviation respectively are :
(a) 1 and 5
(b) 7 and 6
(c) 7 and 4
(d) 1 and 6
CBSE 2025 (31/2/1)
Q6.
The colour of light for which the refractive index of glass is minimum, is:
(a) Red
(b) Yellow
(c) Green
(d) Violet
CBSE 2025(31/4/1)
Q7.
Assertion (A): When ciliary muscles contract, eye lens becomes thin.
Reason (R): Ciliary muscles control the power of the eye lens.
CBSE 2025(31/4/1)
Q8.
Assertion (A): Myopic eye cannot see distant object distinctly.
Reason (R): For correction of myopia converging lens of appropriate power are prescribed by eye-surgeons.
CBSE 2024(31/2/1)
Q9.
(a) State one important function of the following parts of the human eye :
(i) Retina (ii) Pupil
(b) State the role of ciliary muscles in focussing objects at varying distances from the eye.
CBSE 2023(31/5/1)
Q10.
(a) Define the term power of accommodation of human eye.
(b) Write the name of the part of eye which plays a major role in the process of accommodation and explain what happens when human eye focuses (i) nearby objects and (ii) distant objects.
CBSE 2024 (31/2/1)
Q11.
Name the type of lenses required by the person for the correction of their defect of vision called presbyopia. Write the structure of the lenses commonly used for the correction of this defect giving reason for such designs.
CBSE 2025(31/4/1)
Q12.
It is observed that the power of an eye to see nearby objects as well as far off objects diminishes with age.
(i) Give reason for the above statement.
(ii) Name the defect that is likely to arise in the eyes in such a condition.
(iii) Draw a well labelled diagram to show the type of corrective lens used for restoring the vision of such an eye.
CBSE 2023(31/1/1)
Q13.
Observe the following diagram and answer the questions following it:
(i) Identify the defect of vision shown.
(ii) List its two causes.
(iii) Draw a ray diagram to show the correction of this defect using a suitable lens. Also name the lens.
CBSE 2023(31/4/1)
Q14.
Observe the following diagram showing an image formation in an eye:
(a) Identify the defect of vision shown in the figure.
(b) List its two causes and suggest a suitable corrective lens to overcome its defect.
(c) Draw a ray diagram to show the correction of this defect using a suitable corrective lens.
CBSE 2023 (31/5/1)
Q15.
The power of a lens ‘X’ is – 2·5 D.
(i) Name the lens and determine its focal length in cm.
(ii) For which eye defect of vision will an optician prescribe this type of lens as a corrective lens ?
CBSE 2025(31/1/1)
Q16.
A person uses lenses of +2.0 D power in his spectacles for the correction of his vision.
(a) Name the defect of vision the person is suffering from.
(b) List two causes of this defect.
(c) Determine the focal length of the lenses used in the spectacles.
CBSE 2025(31/6/1)
Q17.
Draw a ray diagram to show the refraction of a ray of light passing through an equilateral glass prism. Mark the angle through which the emergent ray bends from the direction of the incident ray and also name it.
CBSE 2025(31/4/1)
Q18.
Name and explain the phenomenon of light due to which the path of a beam of light becomes visible when it enters a smoke filled room through a small hole. Also state the dependence of colour of the light we receive on the size of the particle of the medium through which the beam of light passes.
CBSE 2024(31/3/2)
Q19.
A narrow beam XY of white light is passing through a glass prism ABC as shown in the diagram:
(a) Trace it on your answer sheet and show the path of the emergent beam as observed on the screen PQ.
(b) Name the phenomenon observed and state its cause.
(c) What would happen if another glass prism is placed next to the prism ABC in an inverted position. Show with the help of a diagram.
CBSE 2023(31/1/1)
Q20. Case Study
The students in a class took a thick sheet of cardboard and made a small hole in its centre. Sunlight was allowed to fall on this small hole and they obtained a narrow beam of white light. A glass prism was taken and this white light was allowed to fall on one of its faces. The prism was turned slowly until the light that comes out of the opposite face of the prism appeared on the nearby screen. The studied this beautiful band of light and concluded that it is a spectrum of white light.
(i) Give one more instance in which this type of spectrum is observed.
(ii) What happens to white light in the above case?
(iii) List two conditions necessary to observe a rainbow.
(iv) Draw a ray diagram to show the formation of a rainbow. Mark on it, points (a), (b) and (c) as given below:
(a) Where dispersion of light occurs
(b) Where light gets reflected internally.
(c) Where final refraction occurs.
CBSE 2025(31/4/1)
