Light Shadows and Reflections Class 7 Short Question Answer

Light Shadows and Reflections Class 7 Short Question Answer

Light Shadows and Reflections Class 7 Short Question Answer

Question 1.

Explain how to construct a simple pinhole camera.

Answer:

To construct a pinhole camera, take two cardboard boxes, cut a small hole in one box, and cover the opposite side of the other box with translucent paper. Slide the smaller box into the larger one, ensuring the pinhole faces the object to be viewed.

Question 2.

Describe the difference between the images formed by a pinhole camera and a plane mirror.

Answer:

A pinhole camera produces an upside down image, while a plane mirror produces a laterally inverted image that is not upside down.

Question 3.

What happens to the length of a shadow as the sun moves from morning to noon?

Answer:

As the sun moves from morning to noon, the length (size) of the shadow decreases until it reaches its shortest point at noon.

Question 4.

What is a luminous object?

Answer:

A luminous object is one that emits its own light. Examples include the Sun, stars, and light bulbs. These objects can be easily identified in darkness due to their brightness.

Question 5.

How does light travel through transparent materials?

Answer:

Light passes almost completely through transparent materials, allowing objects behind them to be seen clearly. Examples include glass and clear water, which do not obstruct light significantly.

Question 6.

What is the difference between shadows formed by opaque and translucent objects?

Answer:

Opaque objects create darker shadows as they block all light. In contrast, translucent objects produce lighter shadows since they allow some light to pass through, creating a softer shadow effect.