A virtual, erect and magnified image of an object is to be obtained with a convex lens. For this purpose,the object should be placed:
(a) between 2F and infinity
(b) between F and optical centre
(c) between F and 2F
(d) at F
(b) between F and optical centre
Explanation
When an object is placed at a distance less than the focus i.e., between optical centre, $C$ and focus, $F'$ of a convex lens, then the image formed is virtual, erect, larger than the object (enlarged or magnified), and behind the object (on the left side of the lens).
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- To obtain a magnification of, –0.5 with a convex lens, the object should be placed:(a) at F (b) between optical centre and F(c) between F and 2F (d) beyond 2F
- In order to obtain a magnification of, $-$3 (minus 3) with a convex lens, the object should be placed:(a) between optical centre and F (b) between F and 2F(c) at 2F (d) beyond 2F
- A convex lens produces a magnification of + 5. The object is placed:(a) at focus (b) between $f$ and $2f$(c) at less than $f$ (d) beyond $2f$
- When the object is placed between $f$ and 2$f$ of a convex lens, the image formed is(a) at $f$ (b) at 2$f$ (c) beyond 2$f$ (d) between O and $f$
- If a magnification of, –1 (minus 1) is obtained by using a converging lens, then the object has to be placed:(a) within $f$ (b) at $2f$(c) beyond $2f$ (d) at infinity
- An object is placed between $f$ and $2f$ of a convex lens. Which of the following statements correctly describes its image?(a) real, larger than the object (b) erect, smaller than the object(c) inverted, same size as object (d) virtual, larger than the object
- A burning candle whose flame is 1.5 cm tall is placed at a certain distance in front of a convex lens. An image of candle flame is received on a white screen kept behind the lens. The image of flame also measures 1.5 cm. If f is the focal length of convex lens, the candle is placed:(a) at f (b) between f and 2f (c) at 2f (d) beyond 2f
- Where should an object be placed in front of a convex lens so as to obtain its virtual, erect and magnified image?
- Give the position, size and nature of image formed by a concave lens when the object is placed:(a) anywhere between optical centre and infinity.(b) at infinity.
- Describe with the help of a ray-diagram, the formation of image of a finite object placed in front of a convex lens between f and 2f. Give two characteristics of the image so formed.
- The image formed by a concave mirror is virtual, erect and magnified. The position of object is:(a) at focus (b) between focus and centre of curvature(c) at pole (d) between pole and focus
- “A lens can form a magnified erect image as well as magnified inverted image of an object placed in front of it”. State the nature of this lens and draw ray diagrams to justify the above statement. Mark the positions of O, F, and 2F in the diagram.
- When an object is kept at any distance in front of a concave lens, the image formed is always:(a) virtual, erect and magnified (b) virtual, inverted and diminished(c) virtual, erect and diminished (d) virtual, erect and same size as object
- Where should an object be placed in front of a convex lens to get a real image of the size of the object?(a) At the principal focus of the lens(b) At twice the focal length(c) At infinity(d) Between the optical center of the lens and its principal focus.
- Mark ‘T’ if the statement is true and ‘F’ if it is false:$(a)$. We can obtain an enlarged and erect image with a convex mirror. $(T/F)$$(b)$. A concave lens always forms a virtual image. $(T/F)$$(c)$. We can obtain a real, enlarged, and inverted image by a concave mirror. $(T/F)$$(d)$. A real image cannot be obtained on a screen. $(T/F)$$(e)$. A concave mirror always forms a real image. $(T/F)$
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