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Published on: 13/05/2022
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latest Book back QuestionsDownload 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.
Why are traffic signals red in colour?
2.
What are the causes of ‘Myopia’?
3.
Differentiate convex lens and concave lens.
4.
Define dispersion of light.
5.
State Snell’s law.
1.
(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.
2.
(i) The focal length of eye lens is reduced or the distance between eye lens and retina increases.
(ii) Hence the far point will not be infinity for such eyes and the far point has come closer, with this defect, nearby object can be seen clearly but distant objects cannot be seen clearly.
3.
| 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. |
4.
When a beam of white light or composite light is refracted through any transparent media such as glass or water, it is split into its component colours. This phenomenon is called as dispersion of light.
5.
Snell's law state that, the ratio of the sine of the angle of incidence and sine of the angle of refraction is equal to the ratio of refractive indices of the two media.
\(\frac{\sin i}{\sin r}=\frac{\mu_2}{\mu_1}\)
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Tamilnadu Stateboard 10th Standard Subjects
Tamilnadu Stateboard Standards
