10 Questions
What is an image that cannot be obtained on a screen called?
Virtual image
What type of mirror always forms a virtual and smaller sized image?
Convex mirror
What is the characteristic of an image formed by a plane mirror?
Same size as the object
What is an image that can be obtained on a screen called?
Real image
Which type of mirror cannot form an image that can be obtained on a screen?
Concave mirror
Which of the following statements is true about the image formed by a concave lens?
It always forms a virtual image.
What is the main difference between a convex mirror and a concave mirror?
A convex mirror can form both real and virtual images, while a concave mirror only forms virtual images.
In which situation can a virtual image be formed?
When using a convex lens to view an object placed within its focal point.
Which type of mirror/lens can produce a virtual image larger than the object?
Concave mirror
When observing his image in a plane mirror, David notices that the distance between him and the mirror is 3 m. If he moves 1 m towards the mirror, what will be the new distance between David and his image?
2 m
Study Notes
Mirror and Image Concepts
- An image that cannot be obtained on a screen is called a virtual image.
- A plane mirror always forms a virtual and smaller sized image.
Characteristics of Images
- An image formed by a plane mirror is virtual and smaller.
- An image that can be obtained on a screen is called a real image.
Mirror Types and Images
- A concave mirror cannot form an image that can be obtained on a screen (real image).
- A convex mirror and a concave mirror differ in that a convex mirror has a curved outward shape, while a concave mirror has a curved inward shape.
Image Formation Situations
- A virtual image can be formed when an object is placed inside the focal length of a mirror or lens.
- A concave lens can produce a virtual image that is smaller than the object.
- A convex mirror or a concave lens can produce a virtual image larger than the object.
Image Distance and Movement
- When an object moves towards a plane mirror, the distance between the object and the image decreases.
- If David moves 1 m towards the mirror, the new distance between David and his image will be 4 m (initial distance 3 m + 1 m moved towards the mirror).
Prepare for your Class 7 Science examinations with NCERT solutions for Chapter 15 - Light. Learn about light, reflection, and more to score well in your exams.
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