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WorksheetsGeometrical Optics
Total questions: 20
Worksheet time: 40mins
The law of reflection states that the reflected angle
is equal to the incident angle
is always less than the incident angle
is always greater than the incident angle
is greater than or equal to the incident angle
When a ray of light enters a glass slab from air
its wavelength increases
its wavelength
decreases
its frequency increases
neither its wavelength nor frequency changes
A ray of light strikes a thick sheet of glass (n = 1.5) at an angle of 30 degrees with the normal. Find the angle of the refracted ray within the glass with respect to the normal.
19.46 degree
20 degree
19.47 degree
0.33 degree
Water has a refractive index of 1.333. What is the speed of light passing through it? ( Given c= 3x 10 ^8 ms-1)
2.25 x 10^7 ms-1
2.26 x 10^6 ms-1
2.25 x 10^8 ms-1
4.44 x 10 ^8 ms-1
A monochromatic light source emits a wavelength of 500 nm in air. When passing through a liquid, the wavelength reduces to 438 nm. What is the refractive index of a liquid ?
1.44
1.13
1.33
1.14
A monochromatic light in air has a wavelength of 589 nm. It passes trough glass (n = 1.52 ) and then through carbon disulfide (n = 1.63 ). What is its wavelength in carbon disulfide?
261.40 nm
261.35 nm
361.35 nm
362 nm
Total internal reflection is a phenomenon that occurs when a light ray travels from a denser medium to a less dense medium and the angle of incidence is greater than the critical angle. Which one is Total Internal Reflection?
Mirages
Formation of Rainbow
Glasses
Color of peacock’s feathers
Given that the refractive index of air is 1.0003 and the refractive index of diamonds is 2.419, what is the critical angle for internal reflection inside a diamond that is in the air?(sinθ_c= n_2/n_1 )
24.34
23.43
24.43
23.33
Dispersion of Light is when white light is passed through a glass prism it splits into its spectrum of colors. Which one is Light of Dispersion?
Mirages
Mirror
Glasses
Rainbow
A fiber optic cable (n=1.50) submerged in water (n=1.33). What is the critical angle for light to remain inside the cable? (sinθ_c= n_2/n_1 )
63.48
62.46
63.46
64.26
The refractive index for violet light in silica flint glass is 1.66 ant that for red is 1.62. what is the angular dispersion of visible light passing through an equilateral prism of an apex angle of 60° if the angle of incidence is 50°?
6.36
5.32
6.42
4.62
A virtual image is formed 25 cm from a concave mirror, having a radius of curvature of 36 cm. Find the position of the object.
6 cm in front of mirror
6 cm behind mirror
12 cm behind mirror
12 cm in front of mirror
What are the properties of image formed by a concave mirror when the object distance is u < f
virtual
upright
real
magnified
A convex spherical mirror with a focal length of 17 cm will form an image of 12 cm from the mirror. Where should the object be placed?
4.08 cm in front of mirror
7.03 cm behind mirror
7.03 cm in front of mirror
4.08 behind mirror
An object 4.00 cm high is placed 15.00 cm in front of the mirror. What type of mirror and what radius of curvature are required to create an upright image 6.00 cm high?
20 cm, concave mirror
40 cm, concave mirror
20 cm, convex mirror
40 cm, convex mirror
A converging lens with two curved surfaces has a front surface with a radius of curvature = 10 cm and a back surface with a radius of curvature = 20 cm. It is made of material with a refractive index of 2.50. What is the focal length of the lens?
5.45
4.44
3.34
4.64
What are the properties of image formed by converging lenses when the distance of the object is u > f ?
No image
Virtual, upright, diminished
Real, inverted, diminished
Virtual, upright, magnified
A thin lens has a focal length of 25.0 cm. Find the image when the object is placed in front of the lens. Describe the image
650 cm(real, inverted, magnified)
750 cm(virtual, inverted, magnified)
650 cm(real, upright, magnified)
750 cm(real, inverted, diminished)
A planoconvex lens (n= 1.50 ) is flat on one side.What must be the radius of curvature of the curved side to produce a converging lens with a focal length of 20 cm
11 cm
12 cm
15 cm
10 cm
Certain LCD projector contains a single thin lens. A 24.0 mm high object need to be projected so that its image fills a 1.80 m high screen. The distant of the object to the screen is 3.00 m. What is the focal length of the projection lens in cm?
(a)
