Advertisements
Advertisements
प्रश्न
Fill in the following blank with suitable word:
Parallel rays of light are refracted by a convex lens to a point called the ........
उत्तर
Parallel rays of light are refracted by a convex lens to a point called the focus.
APPEARS IN
संबंधित प्रश्न
A student has obtained a magnified image of a flame on a screen using a convex lens. To draw the corresponding ray diagram to show the image formation, which of the following two rays whose paths after refraction are shown, should he select ?
(A) I and II
(B) II and III
(C) III and IV
(D) I and III
What type of lens would you use as a magnifying glass? How close must the object be to the lens?
Describe with the help of a ray-diagram, the size, nature and position of the image formed by a convex lens when an object is placed beyond 2f in front of the lens.
What type of lens is shown in the diagram on the right? What will happen to the parallel rays of light? Show by completing the ray diagram.
A convex lens has a focal length of 10 cm. At which of the following position should an object be placed so that this convex lens may act as a magnifying glass?
(a) 15 cm
(b) 7 cm
(c) 20 cm
(d) 25 cm
How would a pencil look like if you saw it through How would a pencil look like if you saw it through
An object is placed 20 cm from (a) a converging lens, and (b) a diverging lens, of focal length 15 cm. Calculate the image position and magnification in each case.
A lens forms an inverted image of an object. Name the kind of lens.
State the position of object, position of image, nature of image when: Convex lens is used as objective lens of astronomical telescope.
Observe the given figure and answer the following questions.
- Where is the above type of lens construction used?
- What type of image is formed by an objective lens?
- What happens instead of placing at Fo if the object is placed in between O and Fo?
