What is the ruling on a woman adorning herself when going out to study or work, and what is the ruling on lightly plucking eyebrows (al-tanammus)?

The basic principle is that a woman should remain in her home. If she goes out for a need such as study or work, she must adhere to the etiquette of Islamic law regarding covering herself, avoiding adornment and perfume, and not being alone with or intermingling with non-mahram men. Straightening eyebrows is considered namṣ (plucking or thinning eyebrows), which is forbidden in Islamic law.