Table of Contents
- 1 What is the focal length if radius of curvature is 40 cm?
- 2 How do you find the distance of an image in a convex mirror?
- 3 What is the focal length of a convex mirror whose radius of curvature is 40 cm?
- 4 What is the focal length of a concave mirror whose radius is 40 cm answer in CM?
- 5 When an object is placed at a distance of 40 cm from convex lens?
- 6 When an object is placed at a distance 40 cm away from a concave mirror the magnification of the image is 1 the object is placed?
- 7 What is the radius of curvature of a convex mirror?
- 8 What are the properties of a concave mirror?
What is the focal length if radius of curvature is 40 cm?
Answer: The focal length of the given spherical mirror is 20cm.
How do you find the distance of an image in a convex mirror?
The mirror formula is represented by the following equation:
- 1f=1v+1u.
- Where f is the focal length of the mirror, u the object distance is the distance of the object from the mirror and v the image distance is the distance the image is formed from the mirror.
At what distance will the image of an object be obtained in a convex spherical mirror with radius of curvature 40cm if the object is placed at 30cm from the mirror?
Here, u= -40 cm, f=R/2=40/2=20cm. 1v=1f-1u=120-1-40=340,v=403cm. The image is virtual, erect , at the back of the mirror and smaller in size.
What is the size of the image formed by a convex mirror when the object is at Focus?
. As is easily demonstrated, in the paraxial approximation, the focal length of a convex mirror is half of its radius of curvature. Figure 74: The virtual focus of a convex mirror….Image Formation by Convex Mirrors.
| Position of object | Position of image | Character of image |
|---|---|---|
| At | At | Virtual, upright, same size |
What is the focal length of a convex mirror whose radius of curvature is 40 cm?
ANSWER: The focal length of convex mirror with radius of curvature as 40 cm is 20 cm.
What is the focal length of a concave mirror whose radius is 40 cm answer in CM?
20 cm
The correct answer is 20 cm. Given that, Radius of curvature= 40 cm.
What is the distance from a convex mirror of focal length to 30cm?
The answer to the question is 90 cm i.e the object distance is 90 cm from the mirror. CALCULATION: As per the question, the focal length of the convex mirror f = 30 cm.
What is the distance of a convex lens?
between 15 to 20 cm.
The convex lens must have the focal length between 15 to 20 cm.
When an object is placed at a distance of 40 cm from convex lens?
Here, u is the object distance, v is the image distance and f is the focal length. It is given in the problem that A object is placed at distance 40cm in front of convex lens of focal length 20cm. Put u= -40 cm and f= 20 cm. Therefore, the image distance is 40 cm.
When an object is placed at a distance 40 cm away from a concave mirror the magnification of the image is 1 the object is placed?
When an object is placed at a distance of 40 cm from a concave spherical mirror, the magnification produced is 1/2, where should the object be placed to get a magnification of 1/32 Ans.
What is image formed by convex mirror?
The image formed in a convex mirror is always virtual and erect, whatever be the position of the object.
What is the size of the image formed by convex mirror?
The image formed by a convex mirror is of size one-third the size of object .
What is the radius of curvature of a convex mirror?
A convex mirror has a radius of curvature of 20 cm . An object is placed at such a distance from the mirror that the size of the image is exactly half that of the object.
What are the properties of a concave mirror?
1. A concave mirror gives real, inverted and same size image if the object is placed 2. A concave mirror gives virtual, refract and enlarged image of the object but image of smaller size than the size of the object is 3. The radius of curvature of a mirror is 20 cm the focal length is 4.
Why is the image formed in a convex mirror always erect?
We know, the image formed in a convex mirror is always virtual and erect, whatever may be the position of the object. I) When an object is kept at infinity, a virtual image is formed at the focus. Size of the image is much smaller than the object.
What is the distance of the object in front of the mirror?
The object distance must be : A convex mirror has a radius of curvature of 20cm. An object is placed at such a distance from the mirror that the size of the image is exactly half that of the object. The object distance must be : Thus, the object is placed at a distance of 10cm in front of the mirror.