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Published on: 31/08/2019
Optics
Download Tamil Nadu 10th Standard Science question papers, model tests, one-mark questions, important questions, and public exam papers in PDF format. Free study materials and answer keys for TN State Board students.
Questions + Answers key
Take MCQ Science Test1.
If VB, VG, VR be the velocity of blue, green and red light respectively in a glass prism, then which of the following statement gives the correct relation?
VB = VG = VR
VB > VG >VR
VB < VG < VR
VB < VG > VR
2.
In a myopic eye, the image of the object is formed
behind the retina
on the retina
in front of the retina
on the blind spot
3.
Power of a lens is –4D, then its focal length is
4m
–40m
–0.25 m
–2.5 m
4.
The refractive index of four substances A, B, C and D are 1.31, 1.43, 1.33, 2.4 respectively. The speed of light is maximum in
A
B
C
D
5.
Amount of light entering into the eye is controlled by________
6.
According to Rayleigh’s scattering law, the amount of scattering of light is inversely proportional to the fourth power of its____________
7.
The refractive index of a transparent medium is always greater than__________
8.
The path of the light is called as_____________
9.
Why are traffic signals red in colour?
10.
What is power of accommodation of eye?
11.
Differentiate convex lens and concave lens.
12.
Draw a ray diagram to show the image formed by a convex lens when the object is placed between F and 2F.
13.
A beam of light passing through a diverging lens of focal length 0.3m appear to be focused at a distance 0.2m behind the lens. Find the position of the object.
14.
While doing an experiment for the determination of focal length of a convex lens, Raja Suddenly dropped the lens. It got broken into two halves along the axis. If he continues his experiment with the same lens,
(a) can he get the image?
(b) Is there any change in the focal length?
1.
(c)
VB < VG < VR
2.
(c)
in front of the retina
3.
(c)
–0.25 m
4.
(a)
A
5.
( )
Iris
6.
( )
wavelength
7.
( )
one
8.
( )
ray of light
9.
(i) The red colour has longer wavelength.
(ii) So, it can travel for longer distance and will be seen clearly. So red colour is used in traffic signals.
10.
The ability of the eye lens to focus nearby as well as the distant objects is called power of accommodation of the eye.
11.
| S. No. |
Convex Lens |
Concave Lens |
|---|---|---|
| (i) | A convex lens is thicker in the middle than at edges. | A concave lens is thinner in the middle than at edges. |
| (ii) | It is a converging lens. | It is diverging lens. |
| (iii) | It produces mostly real images. | It produces a virtual image. |
| (iv) | It is used to treat hypermetropia. | It is used to treat myopia. |
12.
13.
f = -0.3m, v = -0.2m
\(\cfrac { 1 }{ f } =\cfrac { 1 }{ v } -\cfrac { 1 }{ u } \)
\(\cfrac { 1 }{ u } =\cfrac { 1 }{ v } -\cfrac { 1 }{ f } \)
\(\cfrac { 1 }{ u } =\cfrac { 1 }{ -0.2 } -\cfrac { 1 }{ -0.3 } =\cfrac { -10 }{ 6 } \)
\(u=\cfrac { -6 }{ 10 } =-0.6m\)
14.
a) Yes, he got the image. But the image is not clear.
b) There is no change in the focal length. Because, no change in radius of curvature.
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Tamilnadu Stateboard 10th Standard Subjects
Tamilnadu Stateboard Standards
