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Q34.1. Which of the following changes its focal length when it is immersed in water?. 1. a concave mirror 2. a convex mirror 3. a diverging lens 4. all of the above 5. none of the above. A34.1. Which of the following changes its focal length when it is immersed in water?. - PowerPoint PPT Presentation
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Which of the following changes its focal length when it is immersed in water?
Q34.1
1. a concave mirror
2. a convex mirror
3. a diverging lens
4. all of the above
5. none of the above
Which of the following changes its focal length when it is immersed in water?
A34.1
1. a concave mirror
2. a convex mirror
3. a diverging lens
4. all of the above
5. none of the above
A concave mirror with a radius of curvature of 20 cm has a focal length of
Q34.2
1. 40 cm
2. 20 cm
3. 10 cm
4. 5 cm
5. answer depends on the index of refraction of the air around the mirror
A concave mirror with a radius of curvature of 20 cm has a focal length of
A34.2
1. 40 cm
2. 20 cm
3. 10 cm
4. 5 cm
5. answer depends on the index of refraction of the air around the mirror
An object is placed 15 cm away from a concave mirror of focal length +30 cm. The image formed by the mirror is
Q34.3
1. real and larger than the object
2. real and smaller than the object
3. real and the same size as the object
4. virtual and larger than the object
5. virtual and smaller than the object
An object is placed 15 cm away from a concave mirror of focal length +30 cm. The image formed by the mirror is
A34.3
1. real and larger than the object
2. real and smaller than the object
3. real and the same size as the object
4. virtual and larger than the object
5. virtual and smaller than the object
A concave mirror forms a real image of a lamp filament.
If you use black paint to cover the lower half of the mirror, what part of the filament will be visible in the image?
Q34.4
1. only the upper half of the filament
2. only the lower half of the filament
3. only the left-hand half of the filament
4. only the right-hand half of the filament
5. the entire filament
A concave mirror forms a real image of a lamp filament.
If you use black paint to cover the lower half of the mirror, what part of the filament will be visible in the image?
A34.4
1. only the upper half of the filament
2. only the lower half of the filament
3. only the left-hand half of the filament
4. only the right-hand half of the filament
5. the entire filament
A thin lens has focal length f = –12 cm.
If an object 9 cm tall is placed 24 cm from the lens, what is the height of the image?
Q34.5
1. 27 cm tall
2. 18 cm tall
3. 9 cm tall
4. 4.5 cm tall
5. 3 cm tall
A thin lens has focal length f = –12 cm.
If an object 9 cm tall is placed 24 cm from the lens, what is the height of the image?
A34.5
1. 27 cm tall
2. 18 cm tall
3. 9 cm tall
4. 4.5 cm tall
5. 3 cm tall
Which statement is true about a farsighted (hyperopic) eye?
Q34.6
1. the image point is in front of the retina;a converging eyeglass lens is used to correct this condition
2. the image point is in front of the retina;a diverging eyeglass lens is used to correct this condition
3. the image point is behind the retina;a converging eyeglass lens is used to correct this condition
4. the image point is behind the retina;a diverging eyeglass lens is used to correct this condition
Which statement is true about a farsighted (hyperopic) eye?
A34.6
1. the image point is in front of the retina;a converging eyeglass lens is used to correct this condition
2. the image point is in front of the retina;a diverging eyeglass lens is used to correct this condition
3. the image point is behind the retina;a converging eyeglass lens is used to correct this condition
4. the image point is behind the retina;a diverging eyeglass lens is used to correct this condition
You are choosing lenses for a telescope that you will use to look at the Moon and planets. You should select
Q34.7
1. an objective lens with a long focal lengthand an eyepiece lens with an even longer focal length
2. an objective lens with a long focal lengthand an eyepiece lens with a shorter focal length
3. an objective lens with a short focal lengthand an eyepiece lens with a longer focal length
4. an objective lens with a short focal lengthand an eyepiece lens with an even shorter focal length
You are choosing lenses for a telescope that you will use to look at the Moon and planets. You should select
A34.7
1. an objective lens with a long focal lengthand an eyepiece lens with an even longer focal length
2. an objective lens with a long focal lengthand an eyepiece lens with a shorter focal length
3. an objective lens with a short focal lengthand an eyepiece lens with a longer focal length
4. an objective lens with a short focal lengthand an eyepiece lens with an even shorter focal length
You are designing a telescope that will use a single lens.
The purpose of the telescope is to take photographs of the Moon.
The linear magnification m of the image will be in the range
Q34.8
1. m > 1
2. 0 < m < 1
3. –1 < m < 0
4. m < –1
You are designing a telescope that will use a single lens.
The purpose of the telescope is to take photographs of the Moon.
The linear magnification m of the image will be in the range
A34.8
1. m > 1
2. 0 < m < 1
3. –1 < m < 0
4. m < –1
