Podcast
Questions and Answers
Which type of lens converges light rays?
Which type of lens converges light rays?
- Diverging lens
- Convex lens (correct)
- Plano-concave lens
- Concave lens
Can a concave lens form a real image on its own?
Can a concave lens form a real image on its own?
- Yes, always
- Only with a virtual object
- No, never (correct)
- It depends on the object distance
What is the nature of the image formed by a convex lens when the object is placed at 2F?
What is the nature of the image formed by a convex lens when the object is placed at 2F?
- Virtual, upright, and magnified
- Virtual, upright, and same size
- Real, inverted, and same size (correct)
- Real, inverted, and diminished
What type of lens is used to correct nearsightedness?
What type of lens is used to correct nearsightedness?
What happens to light rays after passing through a convex lens?
What happens to light rays after passing through a convex lens?
Which of the following describes the image formed by a concave lens?
Which of the following describes the image formed by a concave lens?
If an object is placed at the focal point of a convex lens, where is the image formed?
If an object is placed at the focal point of a convex lens, where is the image formed?
What is the correct term for the point where light rays meet after passing through a converging lens?
What is the correct term for the point where light rays meet after passing through a converging lens?
Which of these optical devices uses convex lenses to magnify small objects?
Which of these optical devices uses convex lenses to magnify small objects?
What is the effect of a concave lens on parallel light rays?
What is the effect of a concave lens on parallel light rays?
Which of the following characteristics is NOT associated with images formed by concave lenses?
Which of the following characteristics is NOT associated with images formed by concave lenses?
Where should an object be placed in front of a convex lens to obtain a real and magnified image?
Where should an object be placed in front of a convex lens to obtain a real and magnified image?
What type of lens is thinner in the middle than at the edges?
What type of lens is thinner in the middle than at the edges?
If parallel light rays enter a lens and converge at a point, what type of lens is it?
If parallel light rays enter a lens and converge at a point, what type of lens is it?
Which lens is used to correct farsightedness?
Which lens is used to correct farsightedness?
An object is placed far away from a convex lens. Where will the image be formed?
An object is placed far away from a convex lens. Where will the image be formed?
Which of these is always true for the virtual image formed by a concave lens?
Which of these is always true for the virtual image formed by a concave lens?
What will you observe if you place an object between a convex lens and its focal point?
What will you observe if you place an object between a convex lens and its focal point?
What is the unit of measure for the power of a lens?
What is the unit of measure for the power of a lens?
Which end of the visible light spectrum has the shortest wavelength and bends the most when passing through a lens?
Which end of the visible light spectrum has the shortest wavelength and bends the most when passing through a lens?
Flashcards
Converging Lens
Converging Lens
A convex lens converges light rays, bringing them to a focus.
Real Image with Concave Lens?
Real Image with Concave Lens?
A concave lens cannot form a real image; it only forms virtual images.
Object at 2F (Convex Lens)
Object at 2F (Convex Lens)
When an object is placed at 2F (twice the focal length) in front of a convex lens, the image is formed at 2F on the other side of the lens, and it is real, inverted, and the same size as the object.
