Science
A spherical mirror and a thin spherical lens have a focal length of -15 cm. The mirror and the lens are likely to be
- both concave
- both convex
- the mirror is concave, and the lens is convex
- the mirror is convex, but the lens is concave
Refraction Lens
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Answer
both concave
Reason — According to the sign convention, the focal length for both a concave mirror and a concave lens is negative.
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Related Questions
The image formed by a concave mirror is observed to be virtual, erect and larger than the object. Where should be the position of the object?
- Between the principal focus and the centre of curvature
- At the centre of curvature
- Beyond the centre of curvature
- Between the pole of the mirror and its principal focus.
Where should an object be placed in front of a convex lens to get a real image of the size of the object?
- At the principal focus of the lens
- At twice the focal length
- At infinity
- Between the optical centre of the lens and its principal focus.
No matter how far you stand from a mirror, your image appears erect. The mirror is likely to be
- only plane
- only concave
- only convex
- either plane or convex
Which of the following lenses would you prefer to use while reading small letters found in a dictionary?
- A convex lens of focal length 50 cm
- A concave lens of focal length 50 cm
- A convex lens of focal length 5 cm
- A concave lens of focal length 5 cm