Question:
Which of the following form(s) a virtual and erect image for
all positions of the object ?
Which of the following form(s) a virtual and erect image for
all positions of the object ?
Updated On: Jun 14, 2022
- Convex lens
- Concave lens
- Convex mirror
- Concave mirror
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The Correct Option is C
Solution and Explanation
For a lens $ \frac{1}{v}-\frac{1}{u}=\frac{1}{f} \, \, \, i.e. \frac{1}{v}=\frac{1}{f}+\frac{1}{u}$
For a concave lens,/and u are negative, i.e. v will always be
negative and image will always be virtual.
For a mirror:
$ \, \, \, \, \, \, \, \frac{1}{v}+\frac{1}{u}=\frac{1}{f} \, \, \, i.e. \frac{1}{v}=\frac{1}{f}-\frac{1}{u}$
Here, / is positive and u is negative for a convex mirror.
Therefore, v is always positive and image is always virtual.
For a concave lens,/and u are negative, i.e. v will always be
negative and image will always be virtual.
For a mirror:
$ \, \, \, \, \, \, \, \frac{1}{v}+\frac{1}{u}=\frac{1}{f} \, \, \, i.e. \frac{1}{v}=\frac{1}{f}-\frac{1}{u}$
Here, / is positive and u is negative for a convex mirror.
Therefore, v is always positive and image is always virtual.
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Concepts Used:
Spherical Lenses
Lenses that are made by combining two spherical transparent surfaces are called spherical lenses. In general, there are two kinds of spherical lenses. Lenses that are made by joining two spherical surfaces that bulge outward are convex lenses, whereas lenses that are made by joining two spherical surfaces that curve inward are concave lenses.
Properties of Convex lens:
- In this, the lenses are thicker in the middle and thinner at the edges.
- They have a positive focal length.
- It intersects the incident rays towards the principal axis
- These lenses are used in the camera, focus sunlight, projector microscope, simple telescope, overhead projector, magnifying glasses, etc.
Properties of Concave lens:
- These lenses are thinner in the middle and thicker at the edges.
- They have a negative focal length.
- It parts the incident rays away from the principal axis.
- These are used in the glasses, spy holes, some telescopes in the doors, etc.