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If sin θ = 7/25, find the values of cos θ and tan θ.

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Trigonometry notes std 10th maharashtra board pdf english medium exercise 6.1

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If the absolute refractive indices of glass and water are 3/2 and 4/3 respectively, what is the refractive index of glass with respect to water?

asked Sep 27, 2021 in Chapter 6: Refraction of light by Doubtly (98.9k points)

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(i). If the speed of light in a medium is 1.5 × 108 m/s, what is the absolute refractive index of the medium?

asked Sep 27, 2021 in Chapter 6: Refraction of light by Doubtly (98.9k points)

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C. If the refractive index of glass with respect to air is 3/2, what is the refractive index of air with respect to glass? (i). 1/2 (ii). 3 (iii). 1/3 (iv). 2/3

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B. We can see the Sun even when it is little below the horizon because of i. Reflection of light ii. Refraction of light

asked Sep 27, 2021 in Chapter 6: Refraction of light by Doubtly (98.9k points)

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A. What is the reason for the twinkling of stars? i . Explosions occurring in stars from time to time ii. Absorption of light in the earth’s atmosphere

asked Sep 27, 2021 in Chapter 6: Refraction of light by Doubtly (98.9k points)

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(ii) A rainbow is the combined effect of the refraction, dispersion, and total internal reflection of light.

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(i) If the angle of incidence and angle of emergence of a light ray falling on a glass slab are i and e respectively, prove that, i = e.

asked Sep 27, 2021 in Chapter 6: Refraction of light by Doubtly (98.9k points)

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Fill in the blanks and Explain the completed sentences. (i) . Refractive index depends on the ............. of light.

asked Sep 27, 2021 in Chapter 6: Refraction of light by Doubtly (98.9k points)

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4.A calorimeter has mass 100 g and specific heat 0.1 kcal/ kg °C. It contains 250 gm of liquid at 30°C having specific heat of 0.4 kcal/kg °C.

asked Sep 27, 2021 in Chapter 5: Heat by Doubtly (98.9k points)

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A thermally insulated pot has 150 g ice at temperature 0°C. How much steam of 100°C has to be mixed to it, so that water of temperature 50°C will be obtained?

asked Sep 27, 2021 in Chapter 5: Heat by Doubtly (98.9k points)

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Liquid ammonia is used in ice factory for making ice from water. If water at 20°C is to be converted into 2 kg ice at 0°C,

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8. Read the following paragraph and answer the questions.

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d. On what basis and how will you determine whether air is saturated with vapour or not?

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c. Explain the role of latent heat in the change of state of a substances?

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b Which principle is used to measure the specific heat capacity of a substance?

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a. What is meant by latent heat? How will the state of matter transform if latent heat is given off?

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c. In cold regions in winter, the rocks crack due to anomalous expansion of water.

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b. How can you relate the formation of water droplets on the outer surface of a bottle taken out of refrigerator with formation of dew?

asked Sep 27, 2021 in Chapter 5: Heat by Doubtly (98.9k points)

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