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प्रश्न
State the condition for the following a ray passes undeviated through the lens .
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उत्तर
If a ray passes undeviated through the lens it is incident at the optical centre of the lens.
संबंधित प्रश्न
Calculate the focal length of a corrective lens having power +2.5 D.
State power of a lens S.I. unit.
How is the power of a lens related to its focal length?
Fill in the following blank with suitable words :
The reciprocal of the focal length in metres gives you the _________ of the lens, which is measured in ___________.
A diverging lens has a focal length of 0.10 m. The power of this lens will be:
A double convex lens has focal length 25 cm. The radius of curvature of one of the surfaces is double of the other. Find the radii, if the refractive index of the material of the lens is 1.5.
A pin of length 2.00 cm is placed perpendicular to the principal axis of a converging lens. An inverted image of size 1.00 cm is formed at a distance of 40.0 cm from the pin. Find the focal length of the lens and its distance from the pin.
Surabhi from std. X uses spectacle. The power of the lenses in her spectacle is 0.5 D.
Answer the following questions from the given information:
- Identify the type of lenses used in her spectacle.
- Identify the defect of vision Surabhi is suffering from.
- Find the focal length of the lenses used in her spectacle.
Increase in the converging power of eye lens cause ‘hypermetropia'
The focal length of a double convex lens is equal to the radius of curvature of either surface. What is the refractive index of its material?
