Advertisements
Advertisements
प्रश्न
What happens to the image formed by a convex lens if its lower part is blackened?
उत्तर
Every part of a lens forms a or complete image. If the lower part of the lens is blackened the complete image will be formed but its intensity will decrease.
APPEARS IN
संबंधित प्रश्न
A beam of light travelling in a rectangular glass slab emerges into air. Draw a ray-diagram indicating the change in its path.
Which of the above two cases illustrates the working of a magnifying glass?
Which type of lenses are:
thicker in the middle than at the edges?
What kind of lens can form:
an inverted diminished image?
The diagram alongside shows the refraction of a ray of light from sir to a liquid.
(a) write the values of (i) angle of incidence, (ii) angle of refraction.
(b) use snell’s law to find the refractive index of liquid with respect to air.
A converging lens forms the image of an object placed in front of it, beyond 2F2 of the lens. Draw a ray diagram to show the formation of the image.
State the position of object, position of image, nature of image when: Convex lens is used in observing biological specimens.
State the nature and position of the object on the principal axis to obtain a virtual and magnified image.
A concave mirror and convex lens are held in water. What changes, if any, do you expect in their focal length?
