Advertisements
Advertisements
प्रश्न
The lens of power + 1·0 D is ______.
पर्याय
Convex of focal length 1·0 cm
Convex of focal length 1·0 m
Concave of focal length 1·0 cm
Concave of focal length 1·0 m.
Advertisements
उत्तर
The lens of power + 1·0 D is convex of focal length 1·0 m.
APPEARS IN
संबंधित प्रश्न
Define the power of a lens.
The lens mentioned in 6(b) above is of focal length 25cm. Calculate the power of the lens.
Which type of lens has (a) a positive power, and (b) a negative power?
Which of the two has a greater power: a lens of short focal length or a lens of large focal length?
Which has more power : a thick convex lens or a thin convex lens, made of the same glass? Give reason for your choice.
The focal length of a lens is +150 mm. What kind of lens is it and what is its power?
Express the power (with sign) of a concave lens of focal length 20 cm.
Find the radius of curvature of the convex surface of a plano-convex lens, whose focal length is 0.3 m and the refractive index of the material of the lens is 1.5.
A stick partly immersed in water appears to be bent. Draw a ray diagram to show the bending of the stick when placed in water and viewed obliquely from above.
In what unit is the power of a lens expressed?
