SYUC-MUFY Physics Tutorial CHAP 1

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TUTORIAL: CHAPTER 1 : OPTICS

Q 1. An infrared spectrophotometer scans the wavelengths from 1 to 16 mm.

Express these ranges in terms of the frequencies of the infrared rays.

Q. 2 What is the frequency of violet light of wavelength 410 nm?

Q. 3 A microwave radiator used in measuring automobile speeds emits

radiation of frequency 1.2 x 109 Hz. What is the wavelength?

Q.4 What is the range of frequencies for visible light? (Take note : Range

of ? : 700 nm to 400 nm )

Q.5 The shadow formed on a screen 4 m away from a point source of light is

60 cm tall. What is the height of the object located 1 m from the source

and 3 m from the shadow?

Q.6 A point source of light is placed 15 cm from an upright 6-cm ruler.

Calculate the length of the shadow formed by the ruler on a wall 40 cm

from the ruler.

Q.7 The speed of light through a certain medium is 1.6 x 108 m/s in a

transparent medium, what is the index of refraction in that medium?

Q.8 If the speed of light is to be reduced by one-third, what must be the index

of refraction for the medium through which the light travels?

Q.9 Light is incident at an angle of 370 from air to flint glass (n = 1.6). What is

the angle of refraction into the glass?

SYUC-MUFY Physics Tutorial CHAP 1

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Q.10 A beam of light makes an angle of 600 with the surface of water. What is

the angle of refraction into the water?

Q.11 Light passes from water (n = 1.33) to air. The beam emerges into air at

an angle of 320 with the horizontal water surface? What is the angle of

incidence?

Q.12 Light in air is incident at 600 and is refracted into an unknown medium at

an angle of 400. What is the index of refraction for the unknown

medium?

Q.13 Light strikes from medium A into medium B at an angle of 350 with the

horizontal boundary. If the angle of refraction is also 350, what is the

relative index of refraction between the two media?

Q.14 A man 1.80 m tall stands 1.2 m from a large plane mirror. How tall is his

image? How far is he from his image?

Q.15 Compute the speed of light in (a) crown glass (n=1.5), (b) diamond

(n=2.42), (c) water (n=1.33), and (d) ethyl alcohol (n=1.36).

Q. 16 If light travels at 2.1 x 108 m/s in a transparent medium, what is the index

of refraction?

Q. 17 Light incident from air at 450 is refracted into a transparent medium at an

angle of 340. What is the index of refraction for the material?

Q. 18 A beam of light has a wavelength of 600 nm in air. What is the wavelength

of this light as it passes into glass (n = 1.50)?

SYUC-MUFY Physics Tutorial CHAP 1

DR

Q. 19 The critical angle for a given medium relative to air is 400. What is the

index of refraction for the medium?

Q.20 If the critical angle of incidence for a liquid to air surface is 460, what is the

index of refraction for the liquid?

Q. 21 What is the critical angle relative to air for (a) diamond, (b) water, and (c)

ethyl alcohol.

Q. 22 The angle of incidence is 300 and the angle of refraction is 26.30. If the

incident medium is water, what might the refractive medium be?

Q. 23 The speed of light in an unknown medium is 2.40 x 108 m/s. If the

wavelength of light in this unknown medium is 400 nm, what is the

wavelength in air?

Q. 24 An object located 30 cm from a thin lens has a real, inverted image

located a distance of 60 cm on the opposite side of the lens. What is the

focal length of the lens?

Q. 25 A light source is 600 mm from a converging lens of focal length 180 mm.

Construct the image using ray diagrams. What is the image distance? Is

the image real or virtual?

Q.26 An object 8 cm high is placed 30 cm from a thin converging lens of focal

length 12 cm. What are the nature, size, and location of the image

formed?

Q. 27 A virtual, erect image appears to be located 40 cm in front of a lens of focal

length 15 cm. What is the object distance?