Spherical Lenses

Q.

Can a concave lens produce a real image$?$

Q. To form a virtual image twice the size of the object, using a convex lens of focal length, $\left(f\right)$ $20cm$, the object distance $\left(u\right)$ must be ______.

1. $u<20cm$
2. $u>40cm$
3. $20cm\le u\le 40cm$
4. $u=20cm$

Q. Where would the image form if the object is placed at a finite distance from a concave lens?

1. At F
2. Between F, O
3. At O
4. Between C, F

Q. Minimum number of rays required to form an image of an object using a convex lens are ___.

1. 4
2. 2
3. 5
4. 3

Q. Where would the image form if the object is placed at a finite distance from a concave lens?

1. Between F, O
2. At F
3. At O
4. Between C, F

Q. Where would the image form if the object is placed at a finite distance from a concave lens?

1. At O
2. Between C, F
3. Between F, O
4. At F

Q.

In the above figure, the parallel rays meet/appear to meet ___.

1. at infinity

2. at $F_1$

3. at $F_2$

4. at $2F_2$

Q. Minimum number of rays required to form an image of an object using a convex lens are ___.

1. 2
2. 5
3. 4
4. 3

Q. Minimum number of rays required to form an image of an object using a convex lens are ___.

1. 2
2. 5
3. 3
4. 4

Q.

In the above figure, the parallel rays meet/appear to meet ___.

1. at $2F_2$

2. at infinity

3. at $F_2$

4. at $F_1$