First Physics Quiz(Test Quiz) Grade 8+9

1. What is the type of this lens?

Converging lens

Diverging lens

A diverging lens is a type of lens that causes parallel light rays to spread out or diverge. It is thinner in the middle and thicker at the edges. This type of lens is commonly used in glasses for people with nearsightedness. The given answer "Diverging lens" suggests that the lens in question is causing the light rays to diverge rather than converge, making it a correct answer.

Explanation

A diverging lens is a type of lens that causes parallel light rays to spread out or diverge. It is thinner in the middle and thicker at the edges. This type of lens is commonly used in glasses for people with nearsightedness. The given answer "Diverging lens" suggests that the lens in question is causing the light rays to diverge rather than converge, making it a correct answer.

2. Choose the correct answer: The characteristics of the image are:

Nature,direction,size,distance.

Point of application, line of action ,direction, magnitude.

No characteristics of the image.

Nature and size only

The correct answer is nature, direction, size, and distance. These characteristics refer to the properties of an image. Nature refers to the type or quality of the image, direction indicates the orientation or angle of the image, size refers to the dimensions or scale of the image, and distance refers to the proximity or placement of the image in relation to other objects. These characteristics are important in understanding and analyzing an image.

Explanation

The correct answer is nature, direction, size, and distance. These characteristics refer to the properties of an image. Nature refers to the type or quality of the image, direction indicates the orientation or angle of the image, size refers to the dimensions or scale of the image, and distance refers to the proximity or placement of the image in relation to other objects. These characteristics are important in understanding and analyzing an image.

3. Choose the correct answer: If d=2 f where d is the distance between Object and lens and f is the focal length :

The image is equal to the object

No image

The image is larger than the object

When the distance between the object and the lens is equal to twice the focal length, the image formed is equal in size to the object. This is because the rays of light from the object converge at the focal point and then diverge again, creating an image that is the same size as the object.

Explanation

When the distance between the object and the lens is equal to twice the focal length, the image formed is equal in size to the object. This is because the rays of light from the object converge at the focal point and then diverge again, creating an image that is the same size as the object.

4. Choose the correct answer(s). The converging lens is:

Thick in the edges and thin in the center.

Thin in the edges and thick in the center.

Collect the rays toward the optical axis.

Scat the rays away from the optical axis.

A converging lens is thin in the edges and thick in the center due to its shape and curvature. This shape allows the lens to bend and converge incoming parallel rays of light towards the optical axis, hence collecting the rays toward the optical axis.

Explanation

A converging lens is thin in the edges and thick in the center due to its shape and curvature. This shape allows the lens to bend and converge incoming parallel rays of light towards the optical axis, hence collecting the rays toward the optical axis.

Submit

5. Choose the correct answer: If d=f where d is the distance between Object and lens and f is the focal length :

The image is equal to the object

No image

The image is larger than the object.

If the distance between the object and the lens is equal to the focal length, there will be no image formed. This is because the rays of light coming from the object will be parallel to each other after passing through the lens, and they will not converge or diverge to form an image. Therefore, the correct answer is "No image."

Explanation

If the distance between the object and the lens is equal to the focal length, there will be no image formed. This is because the rays of light coming from the object will be parallel to each other after passing through the lens, and they will not converge or diverge to form an image. Therefore, the correct answer is "No image."