RECAP: Lenses

Explain the difference between a concave and a convex mirror in terms of their reflective surfaces.

• Concave mirrors have a flat surface, while convex mirrors have a curved surface.

• Concave mirrors curve outward, while convex mirrors curve inward.

• Concave mirrors reflect light in a straight line, while convex mirrors reflect light in a scattered manner.

• Concave mirrors curve inward, while convex mirrors curve outward.

What type of image is formed by a concave mirror when the object is located beyond the focal point?

• Virtual, inverted, and enlarged in size

• Real, inverted, and reduced in size

• Real, upright, and enlarged in size

• Virtual, upright, and reduced in size

Explain the concept of a virtual image and provide an example of where it is commonly observed.

• A virtual image is an image formed by the apparent intersection of light rays that do not actually converge. It is commonly observed in a plane mirror.

• A virtual image is a physical object that can be touched and felt. It is commonly observed in a hologram.

• A virtual image is an image formed by the actual convergence of light rays. It is commonly observed in a concave mirror.

• A virtual image is an image that can only be seen by one eye. It is commonly observed in a convex lens.

A diverging lens forms an image that is virtual, upright, and reduced in size. What type of image is this?

• Virtual image

• Real image

• Inverted image

• Enlarged image

Explain the concept of total internal reflection and provide an example of where it occurs.

• Total internal reflection occurs when light passes from a medium with a higher refractive index to a medium with a lower refractive index at an angle greater than the critical angle. An example of this is the mirage effect in deserts.

• Total internal reflection occurs when light passes from a medium with a lower refractive index to a medium with a higher refractive index at an angle greater than the critical angle. An example of this is the formation of rainbows.

• Total internal reflection occurs when light passes from a medium with a higher refractive index to a medium with a lower refractive index at an angle less than the critical angle. An example of this is the refraction of light in a glass prism.

• Total internal reflection occurs when light passes from a medium with a lower refractive index to a medium with a higher refractive index at an angle less than the critical angle. An example of this is the dispersion of light in a glass prism.

What is nature of the image

Which has least refractive index ?

• Water

• Air

• Glass

• Kerosene

Which diagram shows a ray hitting a semicircular glass block at the critical angle, θ?

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A lens has a focal length f.

What are the required conditions for the lens to be used as a magnifying lens?

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What does the word "converging" mean?

• to separate
• to come together
• parallel 
• perpendicular