A concave lens has a focal length of -15 cm. What is the nature of the image for

A concave lens has a focal length of -15 cm. What is the nature of the image formed by the lens when an object is placed at 30 cm from the lens?

A concave lens has a focal length of -15 cm. What is the nature of the image formed by the lens when an object is placed at 30 cm from the lens?

Step 1: Identify the type of lens. We have a concave lens.
Step 2: Note the focal length of the lens, which is -15 cm (the negative sign indicates it's a concave lens).
Step 3: Determine the position of the object. The object is placed at 30 cm from the lens.
Step 4: Compare the object distance (30 cm) with the focal length (-15 cm). Since 30 cm is greater than -15 cm, the object is beyond the focal length.
Step 5: Understand the properties of a concave lens. When the object is beyond the focal length, the image formed is virtual and erect.
Step 6: Conclude that the image formed by the concave lens in this case is virtual and erect.

Lens Formula – Understanding the relationship between object distance, image distance, and focal length using the lens formula (1/f = 1/v - 1/u).
Nature of Images – Identifying the characteristics of images formed by concave lenses, including virtual, erect, and diminished.